Alchemist
* 
Reaper's Scythe can kill Alchemist before Chemical Rage has the time to heal him.
* 
Ghost Shroud can prevent Alchemist from attacking Necrophos, as well as make him immune to Acid Spray and Unstable Concoction damage.
* 
Heartstopper Aura will do damage as long as Necrophos is alive based on health percentage, which is a problem for a strength hero such as Alchemist.
Centaur Warrunner
* With high health and rarely buying 
Linken's Sphere or 
Black King Bar, Centaur Warrunner is a good target for Reaper's Scythe. However, Centaur Warrunner can resolve this problem by buying 
Hood of Defiance and it's upgrade 
Pipe of Insight to diminish its damage.
* Heartstopper Aura will do well against high health heroes such as Centaur Warrunner.
Alchemist
* 
Tidebringer will deal lots of damage to Alchemist before he builds physical survivability items.
* 
Torrent and 
X Marks the Spot can control Alchemist at all stages of the game before he has Black King Bar.
* 
Ghostship's rum buff will greatly reduce the Alchemist's damage output in teamfights including his Radiance.
Centaur Warrunner
* X Marks the Spot negates Stampede.
Alchemist
* Heroes who are melee but cannot fight back against Eclipse will really struggle with Luna: 
Monkey King, 
Alchemist, 
Timbersaw.
Centaur Warrunner
* Luna's 
Moon Glaives will not trigger 
Retaliate if they hit some other target first. Also Luna commonly buys items that provide lifesteal such as 
Satanic, which lets her heal from the damage of Retaliate, meaning that Retaliate has little effect against her.
* 
Eclipse can be used to counter-initiate against Centaur Warrunner after he jumps in with 
Blink Dagger, and initiates with 
Hoof Stomp. But remember that Centaur Warrunner can resolve this problem by buying Hood of Defiance and it's upgrade Pipe of Insight to diminish its damage. Or 
Blade Mail to reflect the damage of the Eclipse back at Luna.
* Luna also commonly buys Black King Bar, which will allow her to protect herself from both, Centaur Warrunner's abilities (except for the Retaliate), and damage reflect from Blade Mail.
Additional:
* Luna's Moon Glaives will not trigger Retaliate if they hit some other target first. Also Luna commonly buys items that provide lifesteal such as Satanic, which lets her heal from the damage of Retaliate, meaning that Retaliate has limited effect against her.
* Eclipse can be used to counter-initiate against Centaur Warrunner after he jumps in with Blink Dagger, and initiates with Hoof Stomp. But remember that Centaur Warrunner can resolve this problem by buying Hood of Defiance and it's upgrade Pipe of Insight to diminish its damage. Or Blade Mail to reflect the damage of the Eclipse back at Luna.
* Luna also commonly buys Black King Bar, which will allow her to protect herself from both, Centaur Warrunner's abilities (except for the Retaliate), and damage reflect from Blade Mail.
Alchemist
* Alchemist likes to farm fast and be ahead, unfortunately Lone Druid likes to do the same by taking towers.
* 
Acid Spray will never prove a threat to Lone Druid or his Spirit Bear.
* 
Chemical Rage may not prove so useful once Lone Druid procs entangled keeping him in place.
* 
Monkey King Bar is a very good choice on Lone Druid's Spirit Bear and it directly counters any potential 
Radiance from Alchemist.
* 
Assault Cuirass is another very good Spirit Bear item that further makes Alchemist vulnerable to physical damage, which is all Lone Druid does.
* Alchemist is not the kind of hero who wants to go on single target summon units, by the time he has killed the Spirit Bear his teammates might had already been slayed by his teammates. Not to mention Lone Druid can just resummon it, even if he is successful.
Centaur Warrunner
* 
Battery Assault easily interrupts Centaur Warrunner due to his poor cast animation.
* 
Power Cogs can negate Stampede.
Alchemist
* Axe can force Alchemist to attack him with 
Berserker's Call. High attack speed from Chemical Rage will cause 
Counter Helix to proc multiple times.
* This can get worse if axe has Blade Mail, which then returns all damage to Alchemist himself.
* Axe's abilities can pierce through Black King Bar, which is a common item for Alchemist.
* Berserker's Call grants Axe a huge bonus armor, which greatly counters Alchemist's physical damage for the most part.
Alchemist
* 
Ice Blast cancels out Chemical Rage's rapid health regeneration. It can also take advantage of Alchemist's 
Armlet of Mordiggian toggling, as it will make HP drain insanely fast, essentially killing the bearer in no time.
Additional:
* Ice Blast nullifies the health regeneration granted by Chemical Rage, which Alchemist greatly relies on to stay alive in battle.
* Alchemist tends to build Armlet of Mordiggian which can be deadly during Ice Blast.
Alchemist
* Chemical Rage will rarely save Alchemist against Ursa's 
Fury Swipes.
* 
Enrage allows Ursa to both be a threat to Alchemist and avoid his over time damage.
Centaur Warrunner
* 
Kinetic Field and 
Glimpse can completely negate Stampede.
Alchemist
* Alchemist is a well-known Radiance carrier among other auras your illusions will benefit from. They also get the extra move speed and reduced base attack time from his Chemical Rage, and it's even better if you can catch him as his own rage is about to expire.
* Disruption will buy enough time for all allies to retreat when Alchemist starts to activate 
Unstable Concoction.
Alchemist
* 
Quas-
Exort Invoker can win the mid lane easily against Alchemist because Quas regeneration will nullify Acid Spray's damage over time and Exort damage bonus will allow Invoker to out last hit Alchemist.
Alchemist
* 
Corrosive Haze followed by 
Slithereen Crush takes advantage of Alchemist's main weakness, being physical damage before he has the change to improve his surviability with items.
* 
Bash of the Deep will deal lots of damage during the laning phase.
Alchemist
* Skywrath Mage can easily harass Alchemist in the laning phase with multiple Arcane Bolts. Additionally, if Alchemist is in the process of throwing an Unstable Concoction, and has no way to dispel Ancient Seal, the self stun becomes an easy set up for Mystic Flare.
* Caution, however, as a decently farmed Alchemist with {Item ID:Radiance} and {Item ID:Manta Style} can easily send illusions to harass and force Skywrath Mage out.
Alchemist
* Ember's magic damage build is able to burst down Alchemist due to his low strength gain and Alchemist's normal item pick up.
Alchemist
* 
Shadow Dance allows Slark to not be targeted by Unstable Concoction, making Alchemist stun himself and making himself vulnerable to the enemy.
* 
Dark Pact also allows him to just purge off the stun if timed correctly.
* 
Essence Shift will steal stats over long durations at a time should Alchemist lack the damage to kill Slark.
Centaur Warrunner
* Centaur has nothing to deal with 
Refraction that will negate all of his burst damage.
* 
Psionic Traps provide good vision, making for him harder to initiate.
Centaur Warrunner
* 
Winter Wyvern's 
Arctic Burn can also be a useful tool against Centaur, who generally has very high health. 
Winter's Curse on Centaur can cause Retaliate to damage allies who are forced to attack him.
Alchemist
* 
Viper can bully Alchemist out of mid lane quite easily, forcing him to either retreat into jungle, or stay harassed in lane, and get very few last hits. Vipers break also completely disables 
Greevil's greed which prevents Alchemist to earn his amazing amounts of money.
Alchemist
* 
Pugna's 
Decrepify makes sure that either Alchemist is unable to hit anyone while also being slowed and susceptible to magical damage, or can protect an ally from physical attacks. Besides, Pugna can push early on, when Alchemist is not strong enough to repel it, so by the time Alchemist comes online, he might be forced to sit in base.
Alchemist
* 
Clinkz can use 
Burning Army in teamfights which will cause a problem for Alchemist.
Alchemist
* Heroes who rely on physical damage output to be effective will fare badly against Muerta's 
Pierce the Veil: 
Phantom Assassin, 
Terrorblade, 
Drow Ranger, 
Lifestealer, 
Anti-Mage, Alchemist, 
Lycan, Clinkz, 
Sniper.
Alchemist
* 
Untouchable greatly reduces Chemical Rage's attack speed advantage.
Centaur Warrunner
* Heroes with haste can negate Enchant's slow: 
Weaver, 
Dark Seer, Lycan, 
Centaur Warrunner.
Alchemist
* Heroes that require burst damage to kill will be difficult for Phantom Lancer to take down: Timbersaw, 
Axe, 
Bristleback, Alchemist and 
Underlord
Centaur Warrunner
* His illusions will kill themselves in a few hits because of Retaliate. The nukes from Hoof Stomp and Double-Edge should be enough to clear them for a large portion of the game
* Centaur Warrunner's small mana pool makes 
Diffusal Blade's damage much lower once Centaur doesn't have any more mana left to burn. Keep in mind that Double Edge does not cost mana.
* Be wary when chasing down Phantom Lancer. Hoof Stomp's terrible cast time makes it quite easy to dodge with 
Doppelganger.
Additional:
* Hoof Stomp and 
Double Edge makes short work of Phantom Lancer's illusions.
* Retaliate together with Blade Mail reflects Phanton Lancer's damage and quickly destroys his illusions.
Centaur Warrunner
* 
Focus Fire grants Windranger a massive attack speed bonus, while her attack damage is generally quite low. This, combined with Windranger's low health pool and armor, makes Retaliate do absolutely massive damage over a short time, making Centaur a hero she can never expect to kill or harass.
* 
Windrun grants evasion, but Centaur Warrunner does not rely on successful attacks in order to do damage. Hoof Stomp, Double Edge, and Stampede all do large amounts of magical damage and can completely demolish Windranger in a moment.
Additional:
* 
Stampede can help his teammates escape from Windrun and Focus Fire.
* Retaliate will shred through Windranger's health if she chooses to attack him during Focus Fire.
Alchemist
* Alchemist's Acid Spray can heavily damage Chen's creeps and disrupt his jungling.
* Alchemist builds items like Radiance and 
Battle Fury, allowing him to quickly clear Chen's creeps.
* Alchemist's Greevil's Greed will grant him more bonus gold as he kills Chen's creeps.
Alchemist
* 
Doom can disable Chemical Rage's increased healing, rendering Alchemist helpless against Doom.
* Attacks from 
Infernal Blade can deal serious damage to Alchemist as it deals damage based on the hero's maximum health.
Alchemist
* Doom's low armor makes him weak against Alchemist's high physical damage output.
Centaur Warrunner
* Whenever Doom casts his ultimate, Centaur Warrunner can cast Stampede and allow the Doomed hero to run away, wasting Doom's ultimate.
Additional:
* Stampede can be used to free an ally from the grasp of Doom. Without any means of effective lockdown, kills can be difficult to secure when against an enemy Centaur Warrunner. Also, Centaur's tendency to have lots of health and HP regen tend to help counter Doom.
Centaur Warrunner
* 
Headshot and 
Shrapnel slow is ineffective against a team with haste (which Stampede gives).
* Commonly picked up mobility items and hasted movement during his Stampede (as well as his high health pool) make him extremely hard to kill from a distance, damaging Sniper with Retaliate and Blade Mail if he has one.
* A low health pool and no escape mechanism makes him an easy target for Centaur Warrunner's burst damage and initiation (even making his team possible initiators with Stampede).
Centaur Warrunner
* Stampede can allow Soulbinded heroes to just ran away.
Alchemist
* Magnus has very mediocre damage against Alchemist, because he can survive the stun duration of Reverse Polarity with Chemical Rage.
Centaur Warrunner
* A good Centaur can catch Queen of Pain with a Blink Dagger and Hoof Stomp.
* Retaliate with Blade Mail reflects all of Queen of Pain's damage, especially Sonic Wave.
* Stampede grants a movement speed bonus, which can prevent Queen of Pain from initiating.
* Double Edge can shred her low health pool if she's not careful.
Centaur Warrunner
* Hoof Stomp and Double Edge can often burst down Phantom Assassin from early to mid game.
* Retaliate makes it very unlikely for Phantom Assassin to win the lane against Warrunner. Double Edge can also be used to wear her down, as she has a much smaller health pool than that of Centaur Warrunner until purchasing a 
Ring of Health. 
Stifling Dagger will also trigger Retaliate and 
Blur cannot evade Retaliate.
* Centaur Warrunner's tankiness in combination with armour items that Axe often purchases like Blade Mail, 
Crimson Guard, Assault Cuirass and 
Shiva's Guard can make Phantom Assassin's attacks only tickle Centaur Warrunner.
* Centaur Warrunner just has to be careful about 
Fan of Knives from 
Aghanim's Shard and 
Coup De Grace, as Fan of Knives can disable Retaliate even if Centaur Warrunner is spell immune.
Additional:
* Hoof Stomp and Double Edge can often burst down Phantom Assassin from early to mid game.
* Retaliate makes it very unlikely for Phantom Assassin to win the lane against Warrunner. Double Edge can also be used to wear her down, as she has a much smaller health pool than that of Centaur Warrunner until purchasing a Ring of Health. Stifling Dagger will also trigger Retaliate and Blur cannot evade Retaliate.
* Centaur Warrunner's tankiness in combination with armour items that Centaur Warrunner often purchases like Blade Mail, Crimson Guard, Assault Cuirass and Shiva's Guard can make Phantom Assassin's attacks only tickle Centaur Warrunner.
* Centaur Warrunner just has to be careful about Fan of Knives from Aghanim's Shard and Coup De Grace, as Fan of Knives can disable Retaliate even if Centaur Warrunner is spell immune.
Alchemist
* Chemical Rage mitigates damage from 
Burning Spear.
Additional:
* Chemical Rage negates almost all damage from Burning Spears.
Centaur Warrunner
* Centaur's low Intelligence makes 
Mind Flare do low damage.
* With some creative skill builds, Centaur's Hoof Stomp stun duration should always last longer than 
Spiked Carapace stun, so escaping unscathed is hard for Nyx.
* With Blink Dagger and detection, Centaur can devastate Nyx in the open.
* However, bear in mind that Nyx can also easily initiate on Centaur Warrunner as well if he uses Spiked Carapace in anticipation, and with 
Vendetta. The damage from Retaliate will be reflected back to Centaur Warrunner, stunning him with no chance to react after he's revealed himself, and should guarantee a successful 
Impale.
Centaur Warrunner
* 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.
Alchemist
* Chemical Rage kills Phoenix very quickly in 
Supernova.
Alchemist
* Alchemist can easily farm Spiderlings with Acid Spray and Greevil's Greed.
* Alchemist's Chemical Rage nullifies Broodmother's 
Insatiable Hunger
Additional:
* Greevil's Greed makes Broodmother’s spiderlings far more valuable to Alchemist making it important that he does farm them as opposed to other heroes where the spider's bounties are negligible.
* Acid Spray makes it difficult to attack Alchemist in lane without losing some spiderlings to the damage over time, potentially giving him farm he wouldn't have otherwise.
Centaur Warrunner
* Heroes that can stop Faceless Void from leaping around the fight and controlling its outcome are very strong against him. Heroes such as: Axe, Centaur Warrunner, 
Doom...
Centaur Warrunner
* Durable heroes can stand against Tusk during 1v1: Axe, 
Dragon Knight, 
Night Stalker, Centaur Warrunner, 
Wraith King and more.
Centaur Warrunner
* Heroes who are reliant on illusions: 
Chaos Knight, 
Phantom Lancer, 
Naga Siren.
Additional:
* Centaur's Retaliate will harm all attacking enemies, which will allow Centaur Warrunner to see which is the real Naga Siren.
* A well timed Hoof Stomp followed by Double Edge will clear all Naga's illusions and prevent Naga Siren from escaping with 
Song of the Siren.
Centaur Warrunner
* Heroes who are reliant on illusions: Chaos Knight, Phantom Lancer, Naga Siren.
Centaur Warrunner
* As Terrorblade's damage output comes mainly from direct attacks, he will struggle greatly against heroes who have abilities that give evasion, trigger on attack or which can disarm an enemy hero: Centaur Warrunner, 
Hoodwink, 
Huskar, 
Invoker, 
Leshrac with 
Nihilism from 
Aghanim's Scepter, Lifestealer with Aghanim's Scepter upgraded 
Infest, 
Pangolier, Phantom Assassin, Pugna, 
Techies, 
Windranger etc.
Centaur Warrunner
* Anti-Mage's 
Mana Void won't do a lot of damage because Centaur has a low mana pool. 
Mana Break is also relatively ineffective against him.
Alchemist
* He can quickly take out heroes with low armor (
Tiny) with his great physical damage.
Centaur Warrunner
* 
Troll Warlord's high speed attack makes Retaliate deal a lot of damage to him.
Alchemist
* Heroes that can cancel Charge of Darkness: 
Ogre Magi, 
Earthshaker, 
Lion, 
Rubick, 
Lina, 
Luna, 
Jakiro, 
Dawnbreaker, Alchemist, Ogre Magi, Axe, 
Shadow Shaman, Naga Siren, 
Mars, 
Bane, 
Pudge, 
Clockwerk.
Centaur Warrunner
* Heroes that are hard to gank: Axe, 
Death Prophet, Phantom Lancer, 
Slark, Centaur Warrunner, Bristleback, 
Medusa, Mars.
Centaur Warrunner
* Heroes who have low or high armor but very high health will be difficult for drow to burst down quickly: 
Primal Beast, Axe, Centaur Warrunner.
Centaur Warrunner
* Heroes who can match Void Spirit's mobility (like the aforementioned 
Ember Spirit or 
Queen of Pain) or tank his spells (Dragon Knight or Centaur Warrunner) are very problematic for him.
Centaur Warrunner
* Night Stalker is all about right-clicks. His nuke, 
Void is also not that threatning once you have Hood of Defiance, your core item.
Alchemist
* Sprout is good for trapping melee carries with no escape abilities: 
Sven, Alchemist, Lifestealer etc.
Alchemist
* Acid Spray and Greevil's Greed will quickly destroy pushes with treants.
* Because of his poor movement speed,Alchemist can catch up and kill him with Chemical Rage.
Alchemist
* Heroes who rely on burst physical damage are affected by Lucky Shot's disarm: Terrorblade, Sven, Clinkz, Windranger, Alchemist, Dragon Knight, 
Legion Commander
Centaur Warrunner
* Pangolier will proc Retaliate several times if he attempts to use 
Swashbuckle on Centaur Warrunner.
* Centaur can cast Stampede to allow all of his allies to easily avoid 
Rolling Thunder.
* Centaur's tankiness makes it hard for Pangolier to burst him down in the late game.
Additional:
* When Swashbuckle hits Centaur Warrunner, Retaliate will deal significant damage, as it procs off every strike made.
* Stampede helps allies avoid or disengage from Pangolier during Rolling Thunder, as well as neutralizing the slow debuff from Lucky Shot.
Alchemist
* Visage can quickly kill heroes with low to medium base armor and no innate escape mechanism. Examples include Alchemist, 
Crystal Maiden and 
Zeus.
Centaur Warrunner
* Centaur Warrunner's passive Retaliate makes it so that the familiars cannot attack him without damaging themselves over time, in turn causing them to be destroyed.
Alchemist
* Alchemist has very bad armor and does not build armor items for the large majority of his build, so Jingu Mastery and Wukong's Command can be very deadly.
* 
Desolator, 
Sange and Yasha or Diffusal Blade can all be purchased to increase your damage against Alchemist or just to keep your movement speed high enough to match him while Chemical Rage is active.
* Monkey King is an agility hero and scales with armor, so Acid Spray loses it's effectiveness later in the game.
Alchemist
* Heroes with wide AoE abilities will reveal Monkey King through Mischief: 
Necrophos, 
Phoenix, Alchemist, Earthshaker, 
Razor, 
Tinker, Leshrac, Queen of Pain
Centaur Warrunner
* Heroes that can keep Monkey King stunned for a long time can pose a threat: Axe, Centaur Warrunner.
Alchemist
* Heroes who struggle to fight back against Sven at any point in the game are at a severe disadvantage: Alchemist, Anti-Mage, Crystal Maiden.
Centaur Warrunner
* Heroes who thrive on teamfights can be a problem, such as 
Venomancer, Necrophos, Centaur Warrunner...
Alchemist
* Alchemist's reliance on fast attack speed to do single-target damage makes him vulnerable to 
Static Link. It also goes through Black King Bar, which is a standard item on Alchemist.
* 
Eye of the Storm is great against high health strength heroes as it reduces their survivability to physical damage.
* Razor has early lane push to counter Acid Spray.
Centaur Warrunner
* Centaur can use Stampede to break Static Link. It also prevents Razor from chasing Centaur Warruner or his teammates with Eye of the Storm, and Plasma Field's slow will do nothing to slow them down.
Alchemist
* Melee heroes that get kited easily have hard times dealing with Puck without any lockdowns, as Puck is one of the most mobile heroes. Heroes like Sven, Lifestealer, 
Ursa and Alchemist may have problems to get to Puck without proper initiation items. They also lack reliable lockdowns, as their disables are easily avoidable for Puck, or are just a soft disable.
Centaur Warrunner
* Axe, Bristleback, Centaur Warrunner, 
Spirit Breaker, Pudge, Huskar, Wraith King, Doom: These heroes are too tanky for Puck to burst down. Also, all of them have spells which can deal with and shut Puck down reliably.
Alchemist
* Heroes who are entirely reliant on dealing physical damage and/or have very little to no area-of-effect abilities will make Underlord tickle and will have no effect against him thanks to his 
Atrophy Aura, and will also be unable to ambush Underlord and his team if Underlord chooses to use 
Fiend's Gate to get to a designated point of the map: Phantom Assassin, Terrorblade, Troll Warlord, Drow Ranger, Phantom Lancer, Chaos Knight, Sven, Wraith King, 
Bounty Hunter, Alchemist, 
Templar Assassin, 
Nyx Assassin, Bane.
Alchemist
* Heroes with strong area-of-effect damaging and/or disabling abilities will be able to intercept Underlord and his team when they exit from Fiend's Gate: Luna's Aghanim's Scepter upgraded Eclipse, Dawnbreaker's 
Solar Guardian, Axe's Berserker's Call, Mars's 
Arena of Blood, Jakiro's 
Macropyre, 
Dual Breath and 
Ice Path, Naga Siren's Song of the Siren, Razor's Eye of the Storm and 
Plasma Field, Lina's 
Light Strike Array, 
Broodmother's 
Spinner's Snare from Aghanim's Scepter, 
Elder Titan's 
Earth Splitter and 
Echo Stomp, Alchemist's Unstable Concoction and Acid Spray, Queen of Pain's 
Sonic Wave, Dark Seer's 
Wall of Replica and 
Vacuum, Venomancer's 
Noxious Plague and 
Poison Nova from Aghanim's Scepter, 
Oracle's 
Fortune's End and 
Rain of Destiny from Aghanim's Shard, 
Bloodseeker's 
Blood Rite, 
Enigma's 
Black Hole and 
Midnight Pulse, 
Shadow Fiend's 
Requiem of Souls, 
Batrider's Aghanim's Scepter upgraded 
Flaming Lasso, 
Firefly, 
Flamebreak and 
Sticky Napalm, 
Ancient Apparition's Ice Blast, 
Sand King's 
Epicenter, 
Sand Storm and 
Burrowstrike, 
Gyrocopter's 
Call Down, Ember Spirit's 
Sleight of Fist, Death Prophet's 
Exorcism and 
Silence, Monkey King's 
Wukong's Command, Crystal Maiden's 
Freezing Field, 
Muerta's 
The Calling, Medusa's 
Stone Gaze, Zeus's 
Nimbus from Aghanim's Scepter. 
Dark Willow's 
Bramble Maze, Pangolier's Swashbuckle, 
Grimstroke's 
Soulbind, 
Ink Swell and 
Stroke of Fate, Earthshaker's 
Echo Slam and 
Fissure, 
Puck's 
Dream Coil and 
Waning Rift, Winter Wyvern's Winter's Curse, 
Magnus's 
Reverse Polarity.
Centaur Warrunner
* Decay can be good against Centaur Warrunner, as reducing the health of Centaur can make Double Edge risky.
* His zombies do not proc Retaliate, as it only procs for regular attacks.
Alchemist
* Chemical Rage will take down 
Tombstone in no time.
Additional:
* With Greevil's Greed, Alchemist can farm Tombstone zombies and gain a significant gold advantage.
Alchemist
*
Feast is good against high health strength heroes such as Alchemist.
Rage allows Lifestealer to not be targetable by Unstable Concoction, possibly making Alchemist stun himself.
Aghanim's Scepter upgrades 
Infest similliar 
Heaven's Halberd can applies an undispellable disarm so Alchemist cannot attack during Chemical Rage, forcing him to activate Black King Bar beforehand.
*
* Since Lifestealer build
Centaur Warrunner
*
Feast is an effective tool against Centaur Warrunner, who generally has high health and low armor, and compensates the reflected damage of Retaliate.
Rage can protect Lifestealer from Hoof Stomp, Double Edge, and Stampede.
Hoof Stomp's slow wind up can also be anticipated and negated with Rage.
Retaliate's damage return simply with Feast. Centaur's high strength gain and therefore big health pool makes him an ideal target to Feast on, especially in the late-game.
* If activated,
Additional:
* Centaur Warrunner's active abilities cannot pierce magic immunity.
* Lifestealer can offset