Shadow Fiend/Counters

Bad against...

 * Sniper has a great nuke potential with his long range attacks and the Headshot skill and can also cancel blink dagger with his Shrapnel, and his Assassinate can do a lot of damage.
 * In team-fights is very annoying, and also can stay away from Shadow Fiend's spells.


 * Zeus also have a very good nuke, which is good against Shadow Fiend in the middle lane, he can take off half of your HP with his Lightning Bolt skill as well as see invisibility, he can spam his Arc Lightning to farm and do damage to you as well.


 * Shadow Fiend has a huge lack of mobility, in which Disruptor can explore and easily gank Shadow Fiend with his Glimpse and Static Storm skills. Along with any hero that can do a some amount of damage, Shadow Fiend is pretty much dead. And if he has an Aghanim's Scepter, Shadow Fiend won't be able to activate his Black King Bar, which is the only item that can help him from Disruptor.


 * All of Bane's skills can be used to hinder your game. His first skill, Enfeeble, can prevent Shadow Fiend to farm or do damage to his opponents. His second skill, Brain Sap, is a great nuke against him and, like Zeus, can easily take off Shadow Fiend's HP. His third skill, Nightmare, enables Shadow Fiend to be easily ganked and can take him off the Team Fight. And his Ult, Fiend's Grip, can kill Shadow Fiend and, even if it doesn't, probably a teammate around him will finish Shadow Fiend off.


 * Probably the worst enemy Shadow Fiend can have. First of all, her Refraction can prevent Shadow Fiend from doing any damage at all, it can take the damage from Shadow Fiend's nuke skills as well as 3 hits more. Her Meld can be used to remove your armor and kill you with few hits. Her Psi Blades are probably the best way to remove Shadow Fiend's HP while he is in lane. And her ult can damage Shadow Fiend's mobility even more.


 * Ursa Fury Swipes can kill him in short time and Enrage make it quicker without Ursa injuring.


 * Invoker's high nuke damage spells can deal a considerable amount of damage to Shadow Fiend in the early-mid game. Without Black King Bar, Invoker can deal a lot of damage to Shadow Fiend.


 * Arc Warden can call his Tempest Double to kill Shadow Fiend and spam his all items and skills.
 * Shadow Blade ganking or escaping is also useless because Necronomicon will reveal him.


 * Jakiro mostly deals damage with area-of-effect spells, which makes Shadow Blade noneffective


 * Bounty Hunter's Track makes Shadow Blade escapes or initiations useless


 * Axe's Berserker's Call can catch Shadow Fiend in the creep wave of the midlane, and Counter Helix will diminish Shadow Fiend's health rather quickly, Battle Hunger can harass Shadow Fiend early on when his Right-Click damage is very low. Culling Blade can kill Shadow Fiend quickly because of his low health pool.


 * Pugna's Nether Ward will trigger before Requiem of Souls because it has no delay, also prevents him from continuous spamming Shadowraze

Others

 * Spirit Breaker.
 * Lion
 * Lina
 * Nyx Assassin
 * Weaver
 * Techies

Items

 * Items with stun and disable can give Shadow Fiend out of the action such as; Scythe of Vyse
 * Orchid Malevolence can silence Shadow Fiend soaking up the damage caused by enemies and results to an imminent death.
 * Eul's Scepter of Divinity is Shadow Fiend's mortal enemy, casting on him will disrupt the cast time of Requiem of Souls.
 * Abyssal Blade can bash Shadow Fiend, giving the enemy to attack and results in death.

Good against...

 * Meepo's clones are ineffective when Shadow Fiend's Requiem of Souls is casted, slowing multiple Meepos from a close distance giving him the chance to attack


 * His treants is good source of soul gaining.
 * Even they are both Shadow Blade users. Shadow Fiend can Requiem of Souls while Nature's Prophet arrives after or while Teleportation.


 * Requiem of Souls penetrates Guardian Angel which prevent physical damage only.


 * Even if caught in Pit of Malice, Shadow Fiend can still inflict grave damage to Underlord.
 * If Shadow Fiend spots Dark Rift, he will use Shadow Blade, and after Underlord's team arrives, he will activate Requiem of Souls.


 * Unstable Current will not be triggered by Shadow Fiend's spells.


 * Shadow Fiend is mostly played as right-click carry, so Silencer's spells will be very ineffective.


 * Slark's Shadow Dance does no protection at all to him from Shadow Fiend's spells and sometimes Shadow Fiend will be able to kill Slark with Requiem of Souls in one hit before he can activate Shadow Dance.

Others

 * Any few HP base heroes. Examples are Pugna, Crystal Maiden, Skywrath Mage and Lina
 * Entry
 * Entry

Works well with...

 * Enigma's Black Hole can give Shadow Fiend the advantage of using Requiem of Souls, giving both Enigma and Shadow Fiend the significant gold they can get.


 * Further armor reduction with wave of terror


 * Magnus' ulti can gather enemies at one spot + stun so Shadow Fiend can cast his ultimate more efficiently


 * Massive armor reduction with Amplify Damage goes well with Presence of the Dark Lord


 * Given the ability that Legion Commander can lock down a target for long enough giving Shadow Fiend enough time to cast Requiem of souls even twice while positioning on top of the target to dish out the full damage making it an instakill and a won duel

Others

 * Heroes with pure initiation can easily make Shadow Fiend join in.
 * Sven's Great Cleave and Storm Bolt can grant Shadow Fiend to join the fray.
 * Arc Warden's Magnetic Field can make Shadow Fiend fight in a short second against fragile Heroes.
 * Tidehunter's Ravage can easily stun them out, giving Shadow Fiend to use Requiem of Souls against them.
 * Naga Siren's Song of the Siren can disable them if they are clumped on each other, making Shadow Fiend to cast Requiem of Souls at them.
 * Luna's Aghanim Upgraded Eclipse can be used on Shadow Fiend after/before he initates with Requiem of Souls.
 * Underlord

List of heroes that counter Shadow Fiend, and list of heroes that work well with Shadow Fiend.