Nyx Assassin/Counters

Bad against...

 * completely counters all but one of Nyx's spells, his.
 * combined with an Ancient with spell immunity makes Nyx an easy target with or a gem.


 * completely counter all but one of Nyx's spells, his.
 * cannot be reflected by, while Juggernaut is immune to spells. It does, however, negate damage from one slash/attack.


 * A non-intelligence hero with very powerful spells, damage-over-time and spell-immune s. Depending on levels and farm, any gank on can completely back-fire.


 * silences, leaving the scarab vulnerable to attacks.
 * A natural carrier once his  is completed,  is a counter to most stealth heroes, and  is no exception.


 * 's Familiars are magic immune and Nyx has few solutions to kill them. They deal many instances of damage quickly, making hard to keep from getting cancelled.
 * 's and often tanky item builds make him hard to burst down.
 * 's long range on and  make him hard to escape from and forces you to save  for, since it cannot be disjointed and is his only proper nuke. A good Visage can play chicken with you, hoping you waste your carapace in panic, then delay his  until the perfect moment.


 * Double Necronomicon will reveal him and drain out of his mana, then Zet and his Tempest Double can kill him.
 * Spike Caracape has short duration so Zet can use other unit in control to slow him down.
 * Arc Warden can build Dagon and Ethereal Blade faster than Nyx and can use twice in short time so he disadvantage about farming item and can't fight Zet alone and think heavily to buy Linken Sphere, it'll force him to buy Lotus Orb or Black King Bar.

Others

 * Any hero with Damage over Time and/or a high health pool is good in general against.
 * is vulnerable to silence, especially while ed.
 * Illusion heroes like and.
 * Spike Carapace doesn't work against Heartstopper Aura.

Items

 * Detection items can punish Nyx quite severely.
 * Nyx is defenseless against . However, as of 6.87, does negate one damage instance without reflecting it or stunning the source.
 * can waste Nyx's, since its duration is only 2.25 seconds.
 * Any good strength/HP item like, or even  can completely eliminate Nyx's solo ganking as a threat. Remember that he has a team, however.  serves a similar purpose.
 * Lotus Orb for reflect his Dagon, Ethereal Blade, Scythe of Vyse.
 * Necronomicon 3

Good against...

 * Sniper's is easy to dodge with, causing massive damage to Sniper in the process.
 * Sniper has uncontrollable damage from, setting up an easy stun with , which is usable in . Even cannot reliably prevent this.
 * 's good burst damage potential can kill effectively in the early game due to his generally low health pool.


 * is good at stopping a by simply moving  into the AoE, as long as  is not spell immune and you are not caught by its ulti first.


 * interrupts or  when it procs. The stun may ruin a possible  attempt.


 * can be easily triggered by, or even . Combined with , has to face a deadly 5.2 second stun.


 * takes away the precious mana for, and greatly hinders the mobility of.
 * procs on enemy's.


 * 's on level 4 burns 38,5% of 's mana every 4 seconds if Medusa only increases her mana pool with Intelligence Icon Int.png. Additionally, 60% of the  damage gets mitigated by, burning even more mana.
 * and is uncontrollable damage, possibly proccing . However, they do not target an invisible Nyx.
 * lacks single target damage, making Nyx with extremely hard to deal with if Medusa is your main damage.


 * He can reflect PA critical and stun her. When she stunned, you can kill her easily cause she can't avoid magical damage without BKB.
 * PA has low HP so he can kill her with Vendetta, Impale, Dagon within short times.


 * All of Nyx Assassin's skills can penetrate Windrun ( hits through evasion. Though Vendetta is Physical damage).
 * Impale does not trigger Linken's Sphere, so he can stun an escaping Windranger and kill her short after.
 * Linken's Sphere on Nyx Assassin will block Shackleshot or Focus Fire.

Others

 * Any hero with slow moving high-burst projectiles or big AoE spells are susceptible to Nyx's 's disruptive effects.
 * Heroes with high intelligence gain(Like ) will take massive amounts of damage from Nyx's, which scales with their intelligence.
 * is a valuable scouting/ganking tool, which also may make enemies waste gold on detection. Especially good against heroes who rely on good positioning (like and ).
 * Any Cleave heroes.
 * Any Hero who can buy Radiance: Alchemist, Bloodseeker, Doom, Omniknight, Naga Siren, Spectre, Weaver.

Works well with...

 * deals up to 475 (537.5 with ) pure damage and almost assured to hit with Nyx's long stuns. The extra nuking power makes Nyx a mid-game and even late-game ganking threat.
 * Carl's  combo can set up an easy  or vice versa. Stunning into EMP is also very possible. 's effect delay but high damage in a line could also combo together.


 * This hero can gank together with to gain  damage.
 * can dispel silence.


 * can initiate with or, making him an ideal  target.


 * His Thrist useful for Nyx Assassin to kill them in 1 hit.


 * Track can make Nyx Assassin can hunt the left enemy when the other ally has joined war.

Others

 * Heroes with global or super long range spells can help striking those who cannot be killed by  alone, without having to roam with him.
 * Tanky heroes who can lure enemies to use their AoE nukes, allowing to counter-initiate with.
 * Underlord Pit of Malice help Nyx kill someone who has stuck.
 * Mirana with Moonlight Shadow
 * Hero who mostly build Boots of Travel 2 like Arc Warden, Meepo, Anti-Mage and Tinker.

List of heroes that counter Nyx Assassin, and list of heroes that work well with Nyx Assassin.