Brewmaster
* Brewmaster is slow and has low armor, making his laning stage very difficult against Geminate Attack.
* Apart from the slow moving 
Hurl Boulder, which can be disjointed, he has no control to catch Weaver.
Arc Warden
* A well-timed use of The Swarm provides vision over heroes with high mobility: 
Anti-Mage, 
Arc Warden, 
Dark Seer.
Arc Warden
* Chen in the early game is a faster pusher than Arc Warden until Arc Warden buys Maelstrom.
Arc Warden
* 
Smoke Screen combined with 
Diffusal Blade leaves Arc Warden effectively useless for a while as he struggles to escape the silence with low mobility.
* With Arc Warden's low mobility, 
Tricks of the Trade often deal decent damage to him before he moves out of it.
Arc Warden
* Song of the Siren stops Arc Warden from acting and allows Naga Siren's team to close in on him, past his 
Magnetic Field.
* Mirror Image dispels 
Flux. The illusions created from it also disable the slow from Flux if Arc Warden casts it after Mirror Image.
* Arc Warden's playstyle heavily favors split-pushing, which Naga Siren can compete against with her illusions.
Additional:
* Naga Siren's illusions from 
Mirror Image can depush the lanes pushed by the Tempest Double, relieving the pressure.
* Mirror Image can dispel Flux, and the illusions can stop Flux from working to it's full power.
Arc Warden
* One of Arc Warden's hardest counters, Arc Warden, who has primarily single target damage, will struggle tremendously against Phantom Lancer:
* Flux is paused if even one illusion remains near Phantom Lancer. It can also be dispelled with 
Doppelganger.
* Phantom Lancer can also easily dodge an activated 
Spark Wraith, or use his illusions to trigger it safely.
* 
Phantom Rush allows Lancer to quickly close gap to get inside of Arc Warden's Magnetic Field.
* Phantom Lancer and his clones are able to quickly drain Arc Warden of his mana with a Diffusal Blade. This means Warden's 
Tempest Double will also be summoned without mana.
Additional:
* Doppelganger dispels Flux.
* Phantom Rush closes the distance between Phantom Lancer and Arc Warden.
* 
Juxtapose can overwhelm Arc Warden and nullify his kit which is only effective against isolated enemies.
Brewmaster
* Outworld Destroyer's pure damage will mop up Primal Split's units very quickly.
Brewmaster
* After Brewmaster has committed Thunder Clap and Cinder Brew to gank, Bane can use 
Nightmare on Brewmaster to wait out the debuffs, and might even turn the tables by buying time for allied reinforcements.
* Bane can also prevent Brewmaster from using Primal Split with his long disables.
Arc Warden
* Arc Warden can't use Magnetic Field to stall the damage of 
Nether Blast on towers, but he can buy 
Aghanim's Shard to diminish its damage.
* Arc Warden has no innate disables to stop 
Life Drain and 
Decrepify
* The short cooldown of both Life Drain and Decrepify also means Pugna can deal with Arc Warden and Arc Warden's clone simultaneously most of the time
* A good Pugna looks to end the match early while Arc Warden, a very item reliant hero, thrives in longer matches.
Arc Warden
* Chain Frost can deliver high amounts of damage to Arc and his clone
Arc Warden
* Arc Warden cannot take Centaur Warrunner very easily, and his nukes are not strong enough to deal with Centaur Warrunner.
* Centaur Warrunner deals huge AoE damage and applies an AoE disable through Hoof Stomp, affecting the double as well the main Arc Warden.
* Magnetic Field is not very effective against melee heroes. And to make things worse, Magnetic Field also increases Arc Warden and his allies's attack speed, meaning Retaliate will deal more damage.
* Stampede catches Arc Warden easily due to his lack of escape mechanisms. However, Arc Warden can counter this problem with 
Gleipnir, which is a common item on Arc Warden.
Brewmaster
* 
Ancient Seal's instant cast time will often silence Brewmaster before he can do anything.
* Brewmaster also has no defense against Skywrath Mage's massive magical damage.
Arc Warden
* Invoker's 
Forge Spirit can negate Flux.
* Provided he does a right combo with 
Chaos Meteor, Invoker can easily burst down Arc Warden (plus his clone if he spawns it.)
* An early 
Orchid Malevolence can shut down Arc Warden pretty hard, especially when Invoker has a good lane against him if he kills him early on.
* 
Deafening Blast and 
Ice Wall limit's Arc Wardens mobility and damage, crippling him greatly.
Arc Warden
* Flux is dispelled by Dark Pact.
* Pounce allows Slark to avoid Spark Wraiths.
* Tempest Double allows Slark to build up Essence Shift stacks, especially when it is being used for split pushing.
Brewmaster
* 
Exorcism kills Primal Split's units very quickly.
Brewmaster
* 
Hex's instant cast time will force Brewmaster into the awkward situation of needing some form of spell immunity or block to prevent being immediately hex upon blinking in, or wait until Lion has used all his crowd control before entering a fight. His direct magic burst also makes Brewmaster's Drunken Brawler worthless versus Lion.
Arc Warden
* Storm Spirit can hunt down Arc Warden with his 
Ball Lightning and kill him quickly due to his lack of escape abilities.
* None of his abilities are effective against Storm Spirit, as they can be evaded with Ball Lightning.
Arc Warden
* Arc Warden relies on items and abilities, as well as his 
Tempest Double, to deal damage to enemies. 
Doom effectively denies that and makes Arc Warden useless in fights.
Arc Warden
* Batrider can harass Arc Warden more easily with 
Sticky Napalm thanks to it's low cooldown and mana cost and because of Arc Warden's lower durability and mobility.
* Batrider can use 
Flamebreak to push Arc Warden and Tempest Double out of the Magnetic Field.
* With 
Firefly combined with 
Blink Dagger, Batrider can move faster while dealing damage to both Arc Warden and Tempest Double.
* 
Flaming Lasso allows Batrider to separate Arc Warden from both Magnetic Field and Tempest Double and pull him towards Batrider's team. 
Aghanim's Scepter upgraded Flaming Lasso also allows Batrider to disable both, real Arc Warden and his Tempest Double and pull them towards Batrider's team. And since Arc Warden is not used to buy 
Linken's Sphere, this can be a great problem to him.
* Since Arc Warden is not used to buy 
Black King Bar very ofthen In most of the stages of the game, he will be vulnerable to Batrider's magical damage-over-time output in most of the stages of the game.
* However, Batrider needs to approach Arc Warden carefully as Arc Warden can scout Batrider's location with Spark Wraith. Also, Arc Warden tends to buy Gleipnir which combined with Flux's damage over time can be used to prevent Batrider from even using Blink Dagger.
Additional:
* Batrider can harass Arc Warden more easily with Sticky Napalm thanks to it's low cooldown and mana cost and because of Arc Warden's lower durability and mobility.
* Batrider can use Flamebreak to push Arc Warden and Tempest Double out of the Magnetic Field.
* With Firefly combined with Blink Dagger, Batrider can move faster while dealing damage to both Arc Warden and Tempest Double.
* Flaming Lasso allows Batrider to separate Arc Warden from both Magnetic Field and Tempest Double and pull him towards Batrider's team. Aghanim's Scepter upgraded Flaming Lasso also allows Batrider to disable both, real Arc Warden and his Tempest Double and pull them towards Batrider's team. And since Arc Warden is not used to buy Linken's Sphere, this can be a great problem to him.
* Since Arc Warden is not used to buy Black King Bar very ofthen In most of the stages of the game, he will be vulnerable to Batrider's magical damage-over-time output in most of the stages of the game.
* However, Batrider needs to approach Arc Warden carefully as Arc Warden can scout Batrider's location with Spark Wraith. Also, Arc Warden tends to buy Gleipnir which combined with Flux's damage over time can be used to prevent Batrider from even using Blink Dagger.
Arc Warden
* Arc Warden's Flux is meaningless against Meepo who loves to group up. Meepo is also a very good gap closer, so Arc Warden's Magnetic Field becomes useless.
Additional:
* Flux is severely impaired against Meepo because of 
Divided We Stand.
* Meepo's farming speed and early powerspikes allows him to pressure Arc Warden before he is capable of fighting effectively.
* Without Black King Bar, 
Earthbind and 
Poof can finish Arc Warden quickly before he has time to do much.
Arc Warden
* Heroes with good escape mechanisms are a nuisance to deal with in the early phase of the game: 
Slark, 
Lifestealer, 
Morphling
Arc Warden
* Melee carries who usually buy an early Black King Bar, and have gap closing abilities can be good against the Arc Warden, such as Slark, 
Riki, 
Earthshaker with Aghanim's Scepter, 
Sven with Aghanim's Scepter etc.
Arc Warden
* Heroes that have doubles or clones such as Arc Warden, 
Meepo or 
Lone Druid are vulnerable to Muerta's 
Gunslinger.
Arc Warden
* Heroes with damage-over-time abilities easily allow Bristleback to turn his back in order to proc 
Bristleback continuously and to massively reduce to damage dealt to him: Arc Warden, 
Venomancer, 
Luna.
Additional:
* Arc Warden has relatively lower armor and mobility, which makes him an easy target to apply 
Quill Spray and 
Viscous Nasal Goo stacks.
* Arc Warden also does not like to build a 
Silver Edge as it takes a long time to build up and may slow down the timings for other important items needed in the game like Gleipnir.
* However, do note that in a game where Arc Warden's team has many jumping capabilities or good passives, like a 
Tidehunter or 
Spectre, a Silver Edge becomes incredibly valuable on Arc Warden as not only can he run away from the jumps, he effectively gets 2 breaks, and Bristleback may not be the best pick.
Arc Warden
* Heroes with summons or illusions can counter Flux, such as 
Beastmaster , 
Chen, or 
Shadow Demon.
Arc Warden
* Heroes who depends on illusions and summons: 
Naga Siren, Arc Warden, 
Broodmother will struggle against Great Cleave.
Brewmaster
* Heroes with strong team-fight abilities (especially ultimates) like Tidehunter, 
Brewmaster, 
Death Prophet, etc.
Arc Warden
* None of Arc Warden's abilities are very effective against Broodmother and her spiderlings.
* A good Broodmother looks to end the match early while Arc Warden, a very item reliant hero, thrives in longer matches.
* Arc Warden has no innate disables to stop Broodmother from lifestealing with 
Insatiable Hunger and shredding through his relatively lower armor.
Brewmaster
* Heroes who produce many summons will have a hard time against Storm's Dispel Magic during teamfight: Broodmother, 
Enigma, 
Nature's Prophet.
Brewmaster
* 
Hex's instant cast time will force Brewmaster into the awkward situation of needing some form of spell immunity or block to prevent being immediately hex upon blinking in, or wait until Shaman has used all his crowd control before entering a fight.
* Brewmaster also has no defense against Shadow Shaman lockdowns.
Arc Warden
* Arc Warden with his Magnetic Field will protect allies from Mass Serpent Ward.
Arc Warden
* Luna's Moon Glaives allow her to clear Arc Warden's Tempest Double.
* Luna's short range and fast movement speed allow her to fight Arc Warden inside his Magnetic Field.
Additional:
* Luna's Moon Glaives allow her to clear Arc Warden's Tempest Double.
* Luna's short range and fast movement speed allow her to fight Arc Warden inside his Magnetic Field.
Arc Warden
* 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.
Arc Warden
* Rolling Thunder hits Arc Warden, his Tempest Double and any allies through Magnetic Field.
* Rolling Thunder also causes Pangolier to take no damage from existing stacks of Flux as well as clear all Spark Wraiths on the way.
Arc Warden
* Powerful physical hitters that can destroy Pangolier during his rolling from afar: 
Drow Ranger, 
Sniper, 
Templar Assassin, Arc Warden
Brewmaster
* The three Primal Split brewlings all attacking Templar Assassin at once will remove her 
Refraction quickly, especially with Fire's Permanent Immolation.
* Templar Assassin has no way to stop Brewmaster from using Primal Split by herself, and may get unlucky and miss her 
Meld if trying to burst him during her ally's disable.
Arc Warden
* Flux removes Refraction charges very quickly, and Arc Warden can hit her freely with his better attack animation, speed and range. If she tries to mute in her creep wave, Spark Wraith can quickly kill the ranged creep, forcing her to stay near the melee creeps, again, allowing for easy right clicks.
* With Tempest Double, Arc Warden can easily output 1000 damage (with the stacking of Flux and Spark Wraith and kill Templar Assassin within seconds. She cannot avoid this combo as Spark Wraith will still hit her in Meld.
* A good Arc Warden can destroy the item timings of a Templar Assassin, and mitigate her impact during the mid-game, when she is the strongest.
* In the late game, if Templar Assassin tries to split push with Aghanim's Scepter, Arc Warden's double can always threaten to kill her if equipped with a 
Bloodthorn and a Blink Dagger , or a 
Hurricane Pike, forcing her to have to use Black King Bar to survive.
* Quick reactions can also protect Arc Warden and his allies from Meld strike with Magnetic Field, and if equipped with a Hurricane Pike, Arc Warden can double force himself away from the attacking Templar Assassin to safety, where after her Black King Bar ends, she can die to Arc Warden's right clicks.
Brewmaster
* Brewmaster can use Cyclone to disable Huskar's healer for much longer than most other heroes can, to make Huskar vulnerable.
* Huskar has no way to stop Brewmaster from using Primal Split by himself, but can cut a good amount of his high health away if Huskar's team wants to burst Brewmaster down during a different disable.
Arc Warden
* Heroes with illusions can overwhelm Huskar: Phantom Lancer, Anti-Mage, Arc Warden, Chaos Knight.
Arc Warden
* 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.
Arc Warden
* Arc Warden’s Magnetic Field allows him to defend against Terrorblade if he used 
Metamorphosis.
* Arc also buys a Bloodthorn or a 
Scythe of Vyse, which can prevent Terrorblade from using his abilities.
Arc Warden
* He can use either his own or his double's Flux to bypass the spellblock from Linken's Sphere, using the leftover Flux + Spark Wraith to slow Medusa's already low move speed to a crawl.
* Arc Warden has a farming advantage with double 
Hand of Midas, and can generally bully Medusa with other items that benefit from duplication.
Arc Warden
* Phase Shift is not an advantage against Arc Warden at all because Arc Warden can turn Puck's Phase Shift ability against him by using Spark Wraith, ensuring it to hit. To make this worse, Arc Warden can do it twice with his Tempest Double.
* Flux is also an instant spell (and therefore unavoidable) with a heavy slow and damage over time, which disables Blink Dagger for a certain period of time.
Brewmaster
* 
Cinder Brew and 
Drunken Brawler makes it hard for Monkey King to stack Jingu Mastery.
* 
Cyclone can remove Monkey king for 6 seconds if his allies lack dispels.
* 
Dispel Magic can dispel Jingu Mastery's bonuses.
Arc Warden
* Magnetic Field lets Arc Warden or allies evade Dark Willow's shadow realm attacks. The duration of the evasion can be extended with the clone.
* Spark Wraith also exploits Dark Willow's low mobility.
Arc Warden
* Flux along with Spark Wraith allows Arc Warden to quickly burst down Drow Ranger due to her low health.
* However, Drow Ranger can bypass Magnetic Field's evasion bonus thanks to Marksmanship.
Additional:
* Magnetic Field protects Arc Warden and allies from Drow Ranger's ranged attacks. She most likely will not enter the field since she will lose 
Marksmanship's bonus agility.
* Beware however, as Marksmanship procs will still hit since they have True Strike, so the most damaging arrows will still hit you inside Magnetic Field.
Arc Warden
* Flux will slow and damage Mirana even after she Leaps, since she will likely not be near allies.
* Arc Warden can place Magnetic Field on an ally who has been hit by Sacred Arrow to protect them.
Additional:
* Arc Warden can use his summons to prevent 
Sacred Arrow from hitting himself or his allies.
* Mirana doesn't build items that give armor often, so she usually can't fight against a late game Arc Warden.
Arc Warden
* Magnetic Field's evasion completely negates Sniper's attacks unless he has True Strike.
* Sniper always positions himself far away from battles, which makes him especially vulnerable for Flux and Spark Wraith.
Arc Warden
* Magnetic Field evades most of Gyrocopter's attacks.
Brewmaster
* 
Thunder Clap and Drunken Brawler prevent Faceless Void from maximising his damage potential in fights.
* Cyclone disables Faceless Void during Chronosphere or in general.
Brewmaster
* Dispel Magic from {U:Storm} instantly removes Heavenly Grace and Guardian Angel from Omniknight's allies in its radius of effect.
Arc Warden
* His Tempest Double is not an illusion, but rather a full hero unit, which effectively reduces half of the Supernova's health. His Magnetic Field can tremendously boost his attack speed, allowing him to destroy 
Supernova in no time even when he's affected by 
Fire Spirits.
Additional:
* Tempest Double, Magnetic Field's attack speed bonus, and Arc Warden's high attack range will easily destroy a Phoenix using Supernova much faster than usual.
* Phoenix is very weak against pushers, especially those like Arc Warden who can kill him easily, as his skillset works best in teamfights.
Brewmaster
* 
Primal Split makes Brewmaster invulnerable for the duration, rendering effects of Cold Feet and Ice Blast useless.
* Dispel Magic can dispel Cold Feet from allies.
* Brewmaster can easily run Ancient Apparition down with the slow from Thunder Clap and Cinder Brew.
Brewmaster
* Cyclone from Storm in Primal Split can waste Nyx's Spiked Carapace, since its duration is shorter than the Cyclone's.
Brewmaster
* {U:Earth} has passive 
Spell Immunity, allowing him to walk into the Echo Stomp radius to stun Elder Titan with his Hurl Boulder.
* {U:Storm}'s Cyclone can cancel the channeling of Echo Stomp and take Elder Titan out of the fight for {show:A|Storm|Cyclone|value2} seconds.
Brewmaster
* Dispel Magic can remove Abaddon's 
Aphotic Shield or 
Curse of Avernus on an allied hero.
* Cyclone's lengthy duration wastes much of 
Borrowed Time's duration.
Additional:
* {U:Storm} can use Cyclone on Abaddon when he activates Borrowed Time, wasting its duration.
* Drunken Brawler and Thunder Clap hinder Abaddon from applying Curse of Avernus' silence on him.
Brewmaster
* In general, Brewmaster's Cinder Brew and Thunder Clap makes him good against physical damage carries: 
Ursa, 
Clinkz, 
Faceless Void, 
Troll Warlord, Templar Assassin, 
Phantom Assassin.
Brewmaster
* Heroes who produce many summons will have a hard time against Storm's Dispel Magic during teamfight: Broodmother, Enigma, Nature's Prophet.
Brewmaster
* Brewmaster with Primal Split
* Heroes that can dodge Glimpse:
* 
Puck with 
Phase Shift
* Riki with Tricks of the Trade
* Phantom Lancer with Doppelganger
* 
Ember Spirit with 
Sleight of Fist and 
Activate Fire Remnant
* Chaos Knight with 
Phantasm
* Naga Siren with Mirror Image
* 
Tusk with 
Snowball
* 
Juggernaut with 
Omnislash
* Brewmaster with Primal Split
* Lifestealer with 
Infest
* 
Phoenix with Supernova
Brewmaster
* Heroes with evasions: Phantom Assassin, Brewmaster, 
Hoodwink, 
Windranger.
Additional:
* If Ursa uses 
Enrage Brewmaster can use Cyclone to render him harmless during his ultimate.
* Brewmaster has two spells to slow down Ursa, allowing his team to kite around him easily.
Arc Warden
* Heroes with illusion and clone abilities may confuse Bloodseeker, causing him to waste time in fights: Phantom Lancer, Chaos Knight, Arc Warden
Arc Warden
* Ranged heroes will have a hard time hitting enemies inside Magnetic Field: 
Silencer, 
Viper.
Arc Warden
* Ranged heroes will have a hard time hitting enemies inside Magnetic Field: Silencer, Viper.
Arc Warden
* Heroes that can slow Charge of Darkness by a huge amount: Venomancer, Viper, 
Dazzle, Arc Warden, 
Lion.
Arc Warden
* Arc Warden's Tempest Double is helpful for killing Ogre Magi who lacks AoE damage and disables.
Brewmaster
* Heroes who produce many summons will have a hard time against Storm's Dispel Magic during teamfight: Broodmother, Enigma, Nature's Prophet.
Brewmaster
* In general, Brewmaster's Cinder Brew and Thunder Clap makes him good against physical damage carries: Ursa, Clinkz, Faceless Void, Troll Warlord, Templar Assassin, Phantom Assassin.
Arc Warden
* Any hero that can outrange Plague Ward can neutralize them without putting themselves at risk of receiving Poison Sting: Arc Warden, Chen, Clinkz, Drow Ranger, 
Lina, 
Mirana, Nature's Prophet, 
Pugna and Sniper.
* Special mention to heroes that outrange Plague Ward after obtaining talents that increase attack range.
Brewmaster
* Heroes that excel at grouping up with their team very early will be able to take advantage of a Clinkz that tries to pick off heroes that are alone: Brewmaster, Dazzle, Tidehunter.
Arc Warden
* Arc Warden's Magnetic Field dodges all damage from Death Ward.
Brewmaster
* Heroes with area dispel can kill multiple skeletons at once: Brewmaster, 
Oracle.
Arc Warden
* Heroes with good escape mechanisms are a nuisance to deal with in the early phase of the game: Slark, Lifestealer, Morphling
Arc Warden
* Arc Warden can counter Morphling's strong pushing capabilities by using Magnetic Field to protect buildings.
* Arc Warden also often builds an Orchid Malevolence or Bloodthorn, which can prove dangerous for Morphling.
* Arc Warden can easily break Linken's Sphere with Flux and then slow him with Spark Wraith, making Arc Warden's Tempest Double a legitimate threat as well.
Arc Warden
* Heroes who rely on summons will see them destroyed easily by Overwhelming Odds: 
Lycan, Arc Warden, 
Warlock, Chen
Arc Warden
* Magnetic Field prevents Legion Commander from easily gaining wins with Duel.
Additional:
* Magnetic Field prevents Legion Commander from getting wins with 
Duel.
Brewmaster
* Blinking heroes like Anti-Mage or 
Queen of Pain can often chase down an injured Brewmaster after his ultimate expires.
Arc Warden
* Sonic Wave is a bad choice in abilities if he and the Tempest Double both use 
Blade Mail to reflect the damage to Queen of Pain, potentially killing her outright if her health is low enough.
* Magnetic Field protects himself or his ally from Queen of Pain's attacks unless she has 
Monkey King Bar.
* One more advantage of Tempest Double is that he can deny himself if he is close to death with Shadow Strike's debuff.
Arc Warden
* Heroes with summons or illusions can counter Flux, such as Beastmaster , Chen, or Shadow Demon.
Arc Warden
* Chaos Knight, Lone Druid, Meepo and Arc Warden can be hard targets since Shadow Demon's spells are ill-suited to fight many enemies at once.
Arc Warden
* Heroes who rely on fast attack speed will also trigger Counter Helix frequently: Faceless Void, Troll Warlord, Anti-Mage, Juggernaut, Arc Warden, Morphling
Additional:
* Magnetic Field doesn't provide a protection against 
Berserker's Call and 
Counter Helix and his high attack speed together with Tempest Double will often trigger Counter Helix.
* The threat of a blink and Berserker's Call may make the real Arc Warden stay further back, thus effectively halving the team's damage output for a while.
Arc Warden
* Heroes who can stop Axe from getting close will severely inhibit his presence in fights: 
Bristleback, 
Crystal Maiden, 
Batrider, Arc Warden, 
Winter Wyvern, 
Clockwerk
Arc Warden
* Magnetic Field is useless against melee heroes, so Lycan can attack Arc Warden without missing.
* Flux doesn't affect Lycan that much, because Shapeshift grants immunity to slows and because he is never alone.
* If their Tempest Double has been called, Lycan can still kill Arc Warden before the double expires.
Brewmaster
* Brewmaster can waste a large portion of Lycan's ultimate by putting him in Cyclone.
* Lycan has no way to stop Brewmaster from using Primal Split by himself.
* Lycan's team often tries to push towers as a group, and Brewmaster excels at winning teamfights while trying to defend a tower.
Arc Warden
* Chaos Knight can dispel Flux with Phantasm.
* Chaos Knight can use 
Reality Rift to pull Arc Warden out of Magnetic Field.
* Once Chaos Knight jumps on Arc Warden with Reality Rift, Arc Warden will struggle to escape due to low mobility and lack of stun.
Brewmaster
* Storm's Dispel Magic combined with Thunder Clap deals high damage against Chaos Knight's illusions even in the late game.
* Chaos Knight's reliance on physical damage is easily hindered by Drunken Brawler.
* Chaos Knight's lack of area effect and mobility makes him easily overwhelmed by Primal Split.
Additional:
* Dispel Magic from {U:Storm} can instantly kill Phantasms early on, and can still deal a lot of damage to them late game, revealing the real Chaos Knight.
Arc Warden
* Because of his weak laning phase, Lone Druid absolutely overpowers him in the early to mid game. Lone Druid also directly counters most of his abilities.
* Flux is nullified when the Spirit Bear is nearby.
* Spark Wraith can get soaked by the bear.
* Lone Druid can easily go inside Magnetic Field and punish Zet.
Brewmaster
* Brewmaster can make the Spirit Bear a much smaller threat with Cinder Brew.
* Cyclone removes the bear from a fight so that his team can easily focus on the hero.
* While most heroes would be worn down by a Spirit Bear 
Radiance in the time it takes to kill Lone Druid, Brewmaster is protected in Primal Split.
Brewmaster
* Blinking heroes like
Anti-Mage or 
Queen of Pain can often chase down an injured Brewmaster after his ultimate expires.
Arc Warden
* Anti-Mage Blinks directly into
Magnetic Field, bypassing its protection.
Tempest Double while it is split-pushing.
Mana Break. 
Blink mitigates the threat of Flux slow and allows Anti-Mage to close the distance between himself and Arc Warden.
Manta Style, and can use it so dispel Arc Warden's items that can threaten an Anti-Mage like 
Bloodthorn.
Counterspell significantly reduces the effectiveness of Arc Warden's magical damage.
Black King Bar, jumping on him alone may not be the best idea for Invoker as it could put him in a bad position, while Arc Warden summons his doubles and rain damage into him.
* Anti-Mage's high mobility allows him to deal with
Additional:
* Arc Warden's high reliance on casting abilities leads him to be dependent on mana, which Anti-Mage can quickly burn with
*
* Anti-Mage's ability to farm quickly allows him keep up with Arc Warden's farm while also de-pushing the lanes Arc Warden shoves in with his Tempest Double.
* Anti-Mage also frequently buys
*
* However, do keep in mind that when Arc Warden has a