Enchantress
* Enchantress's lack of AoE abilities allows Broodmother to swarm her with Spiderlings.
* Spawn Spiderlings can kill enchanted creeps.
* However, keep in mind that 
Untouchable makes it harder for Brood to actually hit Enchantress, even if Broodmother is spell immune.
Additional:
* Enchantress can be easily overwhelmed with Broodmother's spiderlings from 
Spawn Spiderlings and Enchantress can only control one of them with 
Enchant and she has no good waveclear (Spawn Spiderlings can also kill creeps controlled with Enchant).
* However, Untouchable's attack speed reduction can make it difficult for Broodmother to kill Enchantress even with any form of spell immunity.
Night Stalker
* Heroes with illusions and summons can manfight Night Stalker: 
Terrorblade, 
Beastmaster, 
Broodmother.
Enchantress
* Amazingly, Enchantress has even lower health than Pugna. Though she does pack quite a punch through 
Impetus, she can't use it if she is under Decrepify.
* Pugna's Magical DPS is way greater than the heal from 
Nature's Attendants, which will also harm her quite a bit if she's next to Nether Ward.
Night Stalker
* Heroes that can punish aggressive heroes, such as: 
Leshrac, 
Shadow Demon, 
Pugna, 
Death Prophet.
Enchantress
* 
Static Link 's damage instants fully ignore Untouchable, combine with 
Eye of the storm and high movement speed compare to Enchantress with no mobility, Razor can easily take away her squishy health pool.
Night Stalker
* Heroes with stronger lane presence that can threaten to kill him: 
Batrider, 
Juggernaut, 
Ursa, 
Monkey King, 
Razor.
Enchantress
* 
Blade Fury dispels the slow from Enchant, and can burst Enchantress down during the laning stage.
* 
Omnislash and 
Swiftslash's physical damage burst ignore untouchable.
* 
Silver Edge is a common item for Juggernaut for dealing with Untouchable.
Additional:
* Blade Fury dispels the slow from Enchant, spell immunity and used to burst her down during the early laning stage.
* Omnislash and Swiftslash's physical damage burst ignore Untouchable.
* Silver Edge is an ideal item for Juggernaut to deal with Untouchable, making her vulnerable to melee attacks.
Night Stalker
* Heroes with stronger lane presence that can threaten to kill him: Batrider, Juggernaut, Ursa, Monkey King, Razor.
Enchantress
* Heroes with haste can negate Enchant's slow: 
Weaver, 
Dark Seer, 
Lycan, 
Centaur Warrunner.
Night Stalker
* 
Night Stalker is all about right-clicks. His nuke, 
Void is also not that threatning once you have 
Hood of Defiance, your core item.
Enchantress
* Sand King is a strong ganker, allowing him to shut down squishy heroes in the early game: 
Phantom Assassin, 
Clinkz, 
Sniper, 
Enchantress.
Night Stalker
* Heroes that rely on slows to get kills: 
Lifestealer, Night Stalker, Ursa, Phantom Assassin, Terrorblade.
Enchantress
* Heroes with break can disable Untouchable for a while: 
Doom and Shadow Demon (via 
Aghanim's Scepter), 
Viper, 
Shadow Shaman with Hex Breaks talent.
Night Stalker
* Heroes that can punish aggressive heroes, such as: Leshrac, Shadow Demon, Pugna, Death Prophet.
Night Stalker
* Void's slow is dispelled by 
Doppelganger or counteracted by 
Phantom Rush.
* 
Spirit Lance's and 
Diffusal Blade's slow reduces Night Stalker's mobility and helps him or his ally escape if they're inflicted by Void or Crippling Fear.
* Night Stalker has no AoE abilites to take out Phantom Lancer's illusions. Even if Night Stalker gets an Aghanim's Scepter, there will be way too many illusions for Night Stalker to handle.
Enchantress
* Magnetic Field makes Impetus miss; if Enchantress decides to enter the field, she is giving up bonus damage since Impetus deals greater damage at higher distance away from targets.
Night Stalker
* Mirror Image can be effective since Night Stalker cannot withstand fighting illusions. If he's unable to tell which Naga Siren is real, he will have a hard time landing his Void. However, if Night Stalker obtains an Aghanim's Scepter, the upgraded Void will hit and may even locate the real Naga Siren in fights.
Additional:
* 
Ensnare and 
Song of the Siren prevents Night Stalker from escaping and ganking during daytime or even nighttime.
* 
Rip Tide reduces Night Stalker's armor, making him easier to focus down.
* 
Mirror Image can be effective against Night Stalker, due to his single target abilities.
Enchantress
* 
Meepo can quickly kill Enchantress with a 
Poof combo, rendering Untouchable useless.
Night Stalker
* Night Stalker's most skills are single targeted which allows other Meepos to Poof, Earthbind and kill him.
Enchantress
* Enchantress's Untouchable slows down Meepos attacks and Impetus can deal heavy pure damage to a single Meepo, however once Meepo has closed the gap she is an easy target for Poof.
Enchantress
* Untouchable won't mitigate Venomancer's magical damage, and Enchantress is vulnerable to magic damage.
* Both 
Venomous Gale and 
Poison Nova lowers the amount of healing received by Enchantress and her allies from Nature's Attendants.
Enchantress
* Untouchable doesn't work against Unleash, as Marci gains 1000+ attack speed for the fury combo.
* Enchantress' low health makes her a fragile target for Marci's damage blasts.
* Marci can use Rebound on one of her enchanted creeps to easily reach the Enchantress and negate the bonus damage dealt by her Impetus. It helps that most of her best creeps have a low attack range, creating a makeshift bridge towards their master.
Enchantress
* 
Windrun's speed allows easy pursuit or escape, while the evasion greatly reduces the threat of Enchantress's Impetus, especially when retreating.
* 
Shackleshot is a powerful disable if Enchantress gets too close to one of her own minions.
* 
Focus Fire can negate Untouchable.
Enchantress
* Enchantress often has a small army of neutral creeps, allowing Medusa to hit her with a later bounce of her Mystic Snake.
Enchantress
* Heroes with haste can negate Enchant's slow: Weaver, Dark Seer, Lycan, Centaur Warrunner.
Night Stalker
* Void's slow is useless against Lycan by activating 
Shapeshift.
* Night Stalker's single target abilities (with the exception of Void upgraded by Aghanim's Scepter) is not very effective against Lycan's 
Summon Wolves during the early and mid game.
Enchantress
* Lycan relies heavily on right clicks making Untouchable very effective against him.
* If he tries to run away Impetus will do huge amounts of damage.
Additional:
* She can Enchant one of the wolves to her side.
* Lycan will struggle greatly to harm Enchantress through her Untouchable which can seriously slow down Lycan's attack speed even if Lycan is spell immune.
Enchantress
* Heroes with haste can negate Enchant's slow: Weaver, Dark Seer, Lycan, Centaur Warrunner.
Enchantress
* Heroes with break can disable Untouchable for a while: Doom and Shadow Demon (via Aghanim's Scepter), Viper, Shadow Shaman with Hex Breaks talent.
Enchantress
* Heroes with break can disable Untouchable for a while: Doom and Shadow Demon (via Aghanim's Scepter), Viper, Shadow Shaman with Hex Breaks talent.
Enchantress
* Heroes with nukes: 
Bane, 
Lich, 
Lion, 
Skywrath Mage
Night Stalker
* Heroes that can punish aggressive heroes, such as: Leshrac, Shadow Demon, Pugna, Death Prophet.
Night Stalker
* 
Bloodseeker's 
Rupture turns Night Stalker mobility against him and 
Thirst grants movement speed bonus and vision prevents Night Stalker from initiating and re-initiating.
Night Stalker
* Heroes that can punish aggressive heroes, such as: Leshrac, Shadow Demon, Pugna, Death Prophet.
Night Stalker
* Heroes that are hard to gank: 
Dragon Knight, 
Mars, Centaur Warrunner.
Night Stalker
* Heroes that are hard to gank: Dragon Knight, Mars, Centaur Warrunner.
Enchantress
* 
Doom with the {ValueColor:1|Doom applies Break|25tal} {Symbol:Talent} talent can be useful against heroes with troublesome passive skills while also disabling them for a long time: Phantom Assassin, Enchantress, 
Huskar, 
Underlord.
Additional:
* 
Devour will easily eating creeps from Enchantress during already cooldown from Devour.
* Even so cooldown from Doom so long, Doom can shut down from Untouchable and can upgrade with Aghanim's Scepter disable all abilities from Enchantress's.
Enchantress
* Heroes with nukes that can jump her: 
Clockwerk, 
Snapfire, 
Spirit Breaker, 
Techies
Night Stalker
* Heroes with stronger lane presence that can threaten to kill him: Batrider, Juggernaut, Ursa, Monkey King, Razor.
Enchantress
* Enchantress has a very low health pool, allowing Zeus to burst her down quickly before she can heal off the damage.
* Zeus will not be affected by Untouchable, as he won't try to attack her with right clicks anyway.
* Zeus can stay out of her attack range while trying to kill her, especially if he has bought an 
Aether Lens.
* Most heroes would want to get on top of Zeus to kill him, but Enchantress does not have this option as doing so would severely limit her Impetus damage.
* The exception is the laning phase, where Enchantress can gank Zeus if she Enchants a good creep.
Night Stalker
* Heroes with low mobility that rely on spells: 
Zeus, 
Lina, 
Crystal Maiden.
Enchantress
* 
Vendetta can deal great damage against her. However, it requires an direct attack, so Nyx Assassin may have difficulties applying Vendetta on her.
* Enchantress's lack of mobility makes her a primary target for ganking with Vendetta.
* 
Mind Flare can deal a great damage against her due to being an Intelligence hero.
* 
Spiked Carapace can reflect Impetus and stun Enchantress.
Additional:
* Spiked Carapace reflects the damage from Impetus.
* Enchantress is a rather squishy hero, making her fall easily to Nyx Assassin's high burst damage.
Night Stalker
* Heroes that have a weak laning stage: 
Spectre, 
Nyx Assassin, Clockwerk, Spirit Breaker, 
Omniknight, 
Pudge.
Enchantress
* Enchantress has a very small health pool and cannot tank Lina's heavy magic burst.
* Untouchable is decently countered by 
Fiery Soul, exposing Enchantress's weakness to physical damage due to her low armor.
* Lina is decent at clearing creeps and can kill Enchantress's creeps quickly.
Additional:
* Enchantress has pitiful health, and cannot tank Lina's heavy magic damage.
* Untouchable is decently countered by Fiery Soul, exposing Enchantress' weakness to physical damage due to her low armor.
* Lina is decent at clearing creeps and can kill Enchantress' creeps quickly.
Night Stalker
* Heroes with low mobility that rely on spells: Zeus, Lina, Crystal Maiden.
Enchantress
* Enchantress has pitiful HP, even more pitiful than Luna, so 
Lucent Beam and 
Eclipse will often harass and/or kill her through her Untouchable.
* With 
Moon Glaives, Luna can clear Enchantress's creep wave efficiently.
Additional:
* Though Enchantress's Untouchable can greatly reduce Luna's attack speed, and can go through any form of Spell Immunity, she has a pitiful HP so Lucent Beam and Eclipse can kill her very quickly.
* Moon Glaives allows Luna to clear Enchantress's creeps very efficiently.
Enchantress
* Heroes that create illusions: Spectre, Shadow Demon, 
Phantom Lancer, 
Naga Siren, 
Chaos Knight, Terrorblade) or bring other units into the fight (such as 
Nature's Prophet, 
Lone Druid, 
Chen, Enchantress, Meepo and 
Arc Warden) can cause Eclipse to strike the illusions/summons unintentionally. However, in many cases Moon Glaives can resolve this issue and eliminate them before activating Eclipse, but that will require lots of farming for right-click items.
Enchantress
* The burst damage from Timbersaw's abilities is more than enough to deal with Enchantress and her creeps.
* Timbersaw doesn't rely on his physical attacks, which makes Untouchable useless against him.
* 
Timber Chain can close the gap between them and minimize damage from Impetus.
* Bear in mind, however, that Timber Chain can also work against Timbersaw if used to escape and that Impetus can ignore 
Reactive Armor if Enchantress is not a primary target for Timbersaw or if he is disabled.
Enchantress
* Timbersaw has a difficult time against magical and pure damage: Lina, Leshrac, Enchantress, 
Queen of Pain
Enchantress
* Untouchable prevents Clinkz from harassing Enchantress in lane by lowering his attack speed.
* Nature's Attendants helps Enchantress to sustain through Clinkz's harassment in lane.
Night Stalker
* The long silence at night prevents Clinkz from escaping with invisibility if Night Stalker can sneak up on him. He also has really low base health, so Night Stalker can usually kill him alone during one cast of Crippling Fear at night.
Enchantress
* Heroes that have an escape that doesn't disjoint projectiles: 
Mirana, 
Faceless Void, 
Magnus
Night Stalker
* 
Dark Ascension reduces vision for the enemy team, which makes it more difficult for Magnus to initiate with Blink Dagger and Reverse Polarity. It is also more likely that Night Stalker will scout out Magnus with Aghanim's Scepter and a 
Gem of True Sight, after which he can silence Magnus with 
Crippling Fear.
Enchantress
* Heroes that have an escape that doesn't disjoint projectiles: Mirana, Faceless Void, Magnus
Night Stalker
* Crippling Fear can silence Faceless Void for a long time, preventing him from using his Time Walk and Chronosphere.
Enchantress
* Impetus is not blocked by 
Guardian Angel. A {U:Satyr Banisher} can also be controlled to dispel Guardian Angel.
Additional:
* Enchantress's Impetus deals pure damage instead of physical damage and ignores Guardian Angel, thus fully negating one of Omniknight's most important abilities for teamfights.
* Similar to Doom, Enchantress can use Enchant on Satyr Banisher, which will give her access to Satyr Banisher's 
Purge, and allow her to remove Heavenly Grace and Guardian Angel.
Night Stalker
* Heroes that have a weak laning stage: Spectre, Nyx Assassin, Clockwerk, Spirit Breaker, Omniknight, Pudge.
Enchantress
* Range-reliant heroes: Sniper, 
Drow Ranger
Night Stalker
* Heroes with weaker mobility will struggle to keep up with Night Stalker: 
Gyrocopter, Ursa, Drow Ranger
Night Stalker
* Crippling Fear silences nearby heroes and cannot be dispelled, which hinders Rubick's way to retaliate when being jumped on.
* With 
Hunter in the Night and Dark Ascension, Night Stalker can find Rubick easily in teamfights. The two spells grants more than enough damage to hunt Rubick down without defensive items.
Enchantress
* Impetus will deal huge amounts of damage when he uses a 
Fire Remnant to escape.
* 
Flame Guard is useless against Impetus as it deals Pure damage.
* Enchant can be used to dispel Flame Guard.
Night Stalker
* Storm Spirit is absolutely helpless if caught within Night Stalker's silence range.
* Common items a Storm Spirit will build will not remove the AoE silence.
Additional:
* Crippling Fear is a silence that can last up to 8 seconds during night, rendering Storm Spirit tied limited to his items in a fight.
* Dark Ascension allows Night Stalker to initiate on Storm Spirit across the impassable terrain around the middle lane, rendering Storm vulnerable in the early game and prevent him from snowballing.
Night Stalker
* Crippling Fear prevents Keeper of the Light from using his spells to keep his team alive during team-fights.
* Dark Ascension is very strong against Keeper of the Light, as it allows Night Stalker to jump the backline and quickly kill the squishy Ezalor, especially when combined with the slow from Void.
Additional:
* Keeper of the Light's Aghanim's Scepter upgrade loses much of its power, due to Night Stalker being able to reduce the duration of daytime by a lot.
Enchantress
* Mirana can instantly kill creeps with Sacred Arrow, making her decent at crippling the armies of Chen or Enchantress.
Enchantress
* Heroes that have an escape that doesn't disjoint projectiles: Mirana, Faceless Void, Magnus
Night Stalker
* The long silence of Crippling Fear at night prevents Mirana from escaping with Moonlight Shadow and Leap. She also has really low base health, so Night Stalker can usually kill her during one cast of Crippling Fear at night.
* With Dark Ascension and Gem of True Sight, Night Stalker can find and kill Mirana, and he is a tanky hero capable of fighting Mirana any stage of the game.
Night Stalker
* Puck cannot use any of its normal means to survive should Night Stalker catch it within Crippling Fear, and goes down quickly.
Additional:
* Void is a potent nuke that is devastating to Puck's low health pool.
* Crippling Fear silence can prevent Puck from casting spells, leaving it vulnerable.
Night Stalker
* Heroes with stronger lane presence that can threaten to kill him: Batrider, Juggernaut, Ursa, Monkey King, Razor.
Enchantress
* Enchant can dispel 
Overpower.
* Enchant's slow can help kite Ursa in fights and also in lane.
* Enchantress can out harass Ursa in lane by using her long attack range and Untouchable, as well as out sustaining him with Nature's Attendants.
Night Stalker
* Heroes with weaker mobility will struggle to keep up with Night Stalker: Gyrocopter, Ursa, Drow Ranger
Night Stalker
* Void can be used to cancel Requiem of Souls.
* Crippling Fear prevents Shadow Fiend from using Shadowraze or Requiem of Souls.
* With Dark Ascension and Gem of True Sight, Night Stalker can find and kill Shadow Fiend easily. He is also a tanky hero that can fight Shadow Fiend at any stage of the game.
Enchantress
* Since Untouchable pierces Spell Immunity, Lifestealer cannot burst her down even with 
Rage; meaning she can heal herself back to full HP.
Night Stalker
* Crippling Fear makes it so Axe might use 
Blink Dagger right into an AoE silence in the middle of everyone.
* Void cripples Axe's already bad movement speed and attack speed.
* Hunter in the Night makes it impossible for Axe to catch up to fleeing or escape from Night Stalker during the night.
* Lastly, Dark Ascension gives full vision over Axe before he initiates, making the opponents all recognize his location immediately and allowing Night Stalker to prevent it or vocally tell his team if needed.
* Night Stalker has very high strength gain, even in the lane, so a successful Culling Blade is very unlikely.
* Axe's 
Blade Mail will likely do nothing to Night Stalker because of his high health and certain requirements for him to do the most damage to be true.
Enchantress
* Heroes with nukes that can jump her: Clockwerk, Snapfire, Spirit Breaker, Techies
Enchantress
* Spirit Breaker won’t do much harm to Enchantress because of Untouchable and Nature's Attendants. Unless Enchantress is low on HP, Spirit Breaker won’t be able to catch her with mere spells.
Night Stalker
* Heroes that have a weak laning stage: Spectre, Nyx Assassin, Clockwerk, Spirit Breaker, Omniknight, Pudge.
Enchantress
* Untouchable greatly reduces Chemical Rage's attack speed advantage.
Enchantress
* Untouchable makes her heavily reduce Elder Titan's physical damage output on her without Spell Immunity.
* Enchant can purge 
Astral Spirit's buff without Spell immunity.
* Nature's Attendants can protect her if she survives the full combo and manages to juke around.
Enchantress
* Untouchable makes it near impossible to stack Burning Spears.
* Impetus' pure damage puts an instant end to Huskar's low-health brinkmanship.
Night Stalker
* Crippling Fear is a good way to shut down and gank Invoker in the early game..
* Void deals good damage to Invoker and makes escaping harder.
* With Hunter in the Night and Void, Invoker can't get away from Night Stalker and won't be able to catch him with Sun Strike during the night.
Night Stalker
* Heroes that have a weak laning stage: Spectre, Nyx Assassin, Clockwerk, Spirit Breaker, Omniknight, Pudge.
Additional:
* Void's mini-stun and silence from Crippling Fear will stop Pudge from using Dismember or turning off his Rot.
* Night Stalker has naturally high health, strength gain and common itemization for survivability through magic resistance, making Night Stalker a poor target for Pudge.
Night Stalker
* Durable heroes can stand against Tusk during 1v1: 
Axe, Dragon Knight, Night Stalker, Centaur Warrunner, 
Wraith King and more.
Enchantress
* Range-reliant heroes: Sniper, Drow Ranger
Night Stalker
* Night Stalker's Crippling Fear at night prevents Shadow Walk for an extended period of time and his Void will make Phase Boots useless. If Night Stalker has True Sight, he can shutdown Bounty Hunter's sneak kill.
Night Stalker
* Heroes that have long silences, such as Night Stalker and 
Silencer, will prevent Abaddon from saving his allies effectively and disable the active component of Borrowed Time.
Night Stalker
* Heroes that have a weak laning stage: Spectre, Nyx Assassin, Clockwerk, Spirit Breaker, Omniknight, Pudge.
Night Stalker
* Heroes with weaker mobility will struggle to keep up with Night Stalker: Gyrocopter, Ursa, Drow Ranger
Night Stalker
* Heroes with mobility/escape mechanisms to dodge Ancient Apparition abilites, or to easily jump on him: 
Riki, Queen of Pain, Phantom Assassin, 
Windranger, 
Bounty Hunter, Spirit Breaker, Night Stalker, 
Storm Spirit, Juggernaut, etc.
Night Stalker
* Earthshaker must be careful not to use Blink Dagger or Aghanim's Scepter upgraded 
Enchant Totem to blink into Riki's 
Smoke Screen or Night Stalker's Crippling Fear, as these field effects will instantly silence Earthshaker and prevent him from initiating.
Additional:
* 
Fissure has a short stun and creates an impassable ridge. However, Night Stalker can fly over it during Dark Ascension.
* Night Stalker can find Earthshaker, disable his Blink Dagger with Void, and then take him out with Crippling Fear.
* Earthshaker may fail his blink combo against Night Stalker's team if he is not careful, as he can blink into the silence.
Night Stalker
* Any heroes with silences can negate the majority of Outworld Destroyer's damage output: Death Prophet, Night Stalker, Drow Ranger, Doom .
Enchantress
* Heroes with nukes that can jump her: Clockwerk, Snapfire, Spirit Breaker, Techies
Additional:
* Techies does huge amounts of magical damage, which will bypass Untouchable.
* Enchantress depends on abilities to do damage and heal, which Blast Off's silence prevents.
Night Stalker
* Dark Ascension also allows Night Stalker to fly over Proximity Mines without triggering them.
* Crippling Fear is effective in stopping Techies from using Blast Off and Void is effective in stopping them from running to the safety of their mines.
Night Stalker
* Heroes with stronger lane presence that can threaten to kill him: Batrider, Juggernaut, Ursa, Monkey King, Razor.
Enchantress
* Impetus pure damage ignores the extra armor granted from Wukong's Command.
* Enchant can dispel Monkey King's Jingu Mastery bonuses.
* Untouchable makes it hard for Monkey King to land Jingu Mastery stacks.
* 
Sproink allows Enchantress to escape from Wukong's Command.
Night Stalker
* Heroes with illusions and summons can manfight Night Stalker: Terrorblade, Beastmaster, Broodmother.
Enchantress
* Untouchable negates Inner Beast's attack speed bonus, making her hard to kill even if stunned by Primal Roar.
* Enchantress can also take control of Beastmaster's summons.
Additional:
* Enchant can control Beastmaster's boars, mitigating his effectiveness during the laning stage and teamfights.
Enchantress
* Heroes that can jump on her: 
Slark, Queen of Pain, 
Anti-Mage
Night Stalker
* Crippling Fear makes Night Stalker one of the best early game gankers to shut down Anti-Mage.
* Night Stalker's low mana pool causes him to take little damage from Mana Void.
Enchantress
* Heroes that can jump on her: Slark, Queen of Pain, Anti-Mage
Night Stalker
* With Dark Ascension he can keep vision on Slark, disabling his 
Shadow Dance regeneration.
* Night Stalker is very fast so without the Pounce in lane, he can simply out distance him during the night.
* Slark is matched in night vision by only a few heroes, Night Stalker happens to be one of them.
Night Stalker
* 
Phoenix turns night to day, overriding Dark Ascension during 
Supernova.
Night Stalker
* Void can interrupt 
Icarus Dive.
* His Crippling Fear's silence will shutdown a spell caster Phoenix.
* However, Phoenix punishes Night Stalker with Supernova because it will turn night into day, and it has a higher priority than Dark Ascension, effectively canceling the passive bonuses Night Stalker gets from Hunter in the Night.
Enchantress
* Heroes with haste can negate Enchant's slow: Weaver, Dark Seer, Lycan, Centaur Warrunner.
Night Stalker
* The long silence of Crippling Fear at night prevents Weaver from using his Shukuchi or Time Lapse.
* With Dark Ascension and Gem of True Sight, Night Stalker can easily find and probably kill Weaver.
* Hunter In the Night's attack speed bonus removes The Swarm's beetles very quickly.
Enchantress
* Heroes that can jump on her: Slark, Queen of Pain, Anti-Mage
Additional:
* Untouchable won't mitigate magic damage, and a squishy Enchantress is very vulnerable to Queen of Pain's magic burst.
Night Stalker
* Night Stalker has a huge, almost instant silence through Crippling Fear. The main problem is that he can get it off while Queen of Pain barely has any vision of him if he creeps up to her during Dark Ascension. She'll have to play very carefully before she gets a 
Black King Bar or a 
Eul's Scepter of Divinity.
Night Stalker
* Phantasm gives Chaos Knight a significant advantage against single-target damage dealers: Lifestealer, Wraith King, Night Stalker, 
Troll Warlord.
Additional:
* 
Chaos Bolt can stun Night Stalker outside of Crippling Fears relatively small radius.
* 
Reality Rift is a great way to force Night Stalker to fight Chaos Knight, a hero with massive health and damage output. It also forces Night Stalker's Crippling Fear off his primary target.
* Night Stalker doesn't have a lot of ways to deal with multiple targets, which makes him vulnerable to 
Phantasm illusions unless Night Stalker buys Aghanim's Scepter.
Enchantress
* Untouchable will significantly slow down Chaos Knight's physical damage with Phantasm.
* Impetus deals double damage to illusions, making it effective against Phantasm.
Additional:
* Untouchable makes all of Chaos Knight's attacks slow therefore he is unable to deal damage, especially his critical damage of 
Chaos Strike, also enables Enchantress to escape easily from his attacks.
* However, Reality Rift can still pose a danger to Enchantress because Chaos Knight can decrease a good amount of armor, making it dangerous because of her little armor stat, as he can burst down Enchantress easily if any of Chaos Knight's allies can apply a break on Enchantress.
Night Stalker
* Heroes with illusions and summons can manfight Night Stalker: Terrorblade, Beastmaster, Broodmother.
Enchantress
* Heroes that can dominate his illusions or create their own illusions of him: Dark Seer, 
Morphling, Enchantress, Shadow Demon, 
Grimstroke with Aghanim's Scepter.
Enchantress
* Heroes like Enchantress and Chen, or heroes that make use of 
Helm of the Dominator are weak to Crystal Maiden, as Frostbite can do wonders against Enchant, 
Holy Persuasion, or dominated creeps. Careful though, as an army of carefully controlled creeps (Enchantress and Chen) can hold many stuns that will cancel Freezing Field.
Additional:
* 
Frostbite does 1000 magical damage to Enchantress's creeps and roots them for 10 seconds, which hinders her ability to gank.
Night Stalker
* Heroes with low mobility that rely on spells: Zeus, Lina, Crystal Maiden.
Enchantress
* Heroes with nukes: Bane, Lich, Lion, Skywrath Mage
Additional:
* Enchantress is very fragile without any form of magic resistance, allowing Lion to easily burst her down.
* Nature's Attendants is a slow heal, making not as much effective against Lion's burst as it could be.
* Her raw movement speed is a fair escape/mobility mechanism, which may allow her to avoid a blindly cast 
Earth Spike, but does nothing against the rest of Lion's abilities, since they are single target and can't miss.
* Since Lion's damage comes mostly from his skills, Untouchable does nothing to mitigate it.
Night Stalker
* Heroes with low health: Lich, Crystal Maiden, Lion.
Enchantress
* Heroes with nukes that can jump her: Clockwerk, Snapfire, Spirit Breaker, Techies
Night Stalker
* Heroes that have a weak laning stage: Spectre, Nyx Assassin, Clockwerk, Spirit Breaker, Omniknight, Pudge.
Enchantress
* Heroes with nukes: Bane, Lich, Lion, Skywrath Mage
Additional:
* Untouchable is useless versus constant Arcane Bolts, and it doesn't help that her strength gain is the lowest in the game.
* A jungle Enchantress can weaken lanes and make Skywrath Mage's job easier.
* The magic amplification from Ancient Seal makes her even squishier to Skywrath and his allies' magic nukes.
Night Stalker
* Heroes with silence such as Riki, Silencer, or Night Stalker prevents Skywrath Mage from using his spells.
Enchantress
* Heroes with nukes: Bane, Lich, Lion, Skywrath Mage
Night Stalker
* Heroes with low health: Lich, Crystal Maiden, Lion.
Night Stalker
* 
Warcry makes it difficult to burst Sven down with both the passive (with 
Aghanim's Shard) and active component.
* Sven under the effect of 
God's Strength and his massive physical damage make Sven very dangerous to engage in the mid game.
Enchantress
* Against her Untouchable, Sven is barely able to hit Enchantress even with his Black King Bar.
Enchantress
* Riki usually buys Diffusal Blade to initiate, which renders Enchantress' movement speed useless, and is usually followed with Smoke Screen.
* Riki can effectively hit Enchantress by 
Tricks of the Trade alongside with Diffusal Blade and Smoke Screen's initiation. For a hero like Enchantress, 3 to 4 hits from Riki is a big deal, unless Enchantress built 
Force Staff earlier.
Night Stalker
* With Dark Ascension and Gem of True Sight, Night Stalker can easily find and kill Riki. Riki will also find it harder to kill the tanky Night Stalker than he would many other heroes.
Enchantress
* All of Tinker's damage is magic/pure and completely ignores Enchantress's Untouchable. And Tinker's nukes can quickly decimate her small HP pool, sometimes even preventing Enchantress from even responding.
* As Enchantress relies solely on her primary attacks to deal damage, and rarely builds something to dispel it, Laser's Blind is particularly effective.
* However, Enchantress will probably build a Linken's Sphere against Tinker's Laser, so getting an additional disable is highly recommended.
Night Stalker
* Night Stalker is one of the best heroes to find (and silence) Tinker in the trees during Dark Ascension.
Additional:
* Night Stalker can easily find Tinker in the trees during Dark Ascension.
* Void's mini-stun will stop Rearm and 
Keen Conveyance
* Crippling Fear's silence will prevent Tinker from fighting back, as Tinker relies on his spells.
Enchantress
* Chen can use Holy Persuasion on creeps controlled by Enchant.
* Ironically, Enchantress can Enchant Chen's creeps.
Enchantress
* Enchantress can turn Chen's own creeps against him with Enchant. The creeps still keep the health buff Holy Persuasion granted them. Aghanim's Shard gives Enchantress 
Little Friends ability, which allows her to turn multiple of Chen's creeps all at once against him.
* Untouchable and Nature's Attendants make her difficult to kill.
Additional:
* Even though Chen can use Holy Persuasion on creeps controlled by Enchant. Enchantress can also use Enchant on Chen's creeps.
* Aghanim's Shard gives Enchantress Little Friends ability, which she can use to turn all of Chen's creeps against him for a short time when casted on him.
* Impetus's high burst damage can often kill any of Chen's allies before he can save them with 
Hand of God
Enchantress
* Heroes with little health or magic resistance are easily picked off with Oracle's magic burst, such as Skywrath Mage, Crystal Maiden, or Enchantress.
Night Stalker
* Heroes with long disables, like Lion, Night Stalker, or 
Legion Commander, can prevent Oracle from using spells or items.
Enchantress
*
Battle Trance and 
Fervor can help Troll Warlord deal with Encahntress through Untouchable.
Untouchable's attack speed slow is easily remedied by Fervor stacks and Battle Trance.
Silver Edge carrier, disabling Enchantress' Untouchable.
Additional:
*
* Troll Warlord is a natural
Night Stalker
*
Whirling Axes (Melee) provides a 60% miss chance, which can make the attack speed bonus from Hunter in the Night largely ineffective.
Berserker's Rage together with 
Battle Trance and 
Fervor stacks gives him a high chance of rooting Night Stalker, which allows Troll Warlord to man-fight Night Stalker in any stage of the game, regardless of whether or not it's night.
Monkey King Bar carrier to counteract this problem.
*
* Night Stalker is not a common