Undying/Counters

Bad against...

 * Necrophos is a dangerous opponent to go against with. Regardless of how many strength Undying has gained from Decay, Necrophos can finish off Undying with Reaper's Scythe once Undying's HP falls below certain threshold.
 * Necrophos's Heartstopper Aura can effectively reduce Undying's HP in a fight.


 * Silencer's Arcane Curse can effectively discourage Undying from casting his spammable spells in a team fight. Or Undying will have to suffer more damage and slow due to the penalty duration of Arcane Curse.
 * Last Word and Global Silence are able to silence Undying for up to 6 seconds, preventing Undying from gaining strength and healing his ally or himself.


 * Zombies summoned from Tombstone will amplify the damage of Echo Slam due to them increasing the echo damage.


 * Flak Cannon enables Gyrocopter to clear the zombies easily.


 * Phantom Lancer and his illusions are able to take down Undying's Tombstone easily.
 * If equipped with Diffusal Blade, Phantom Lancer is able to drain away Undying's mana, causing Undying to suffer from insufficient mana in a team fight.

Others

 * Doom's Doom can silence Undying for a long period of time.
 * Death Prophet is able to silence Undying up to 6 seconds. Besides, due to Undying high strength during a team fight, Spirit Siphon is a powerful spell against Undying thanks to the percentage health drain.
 * Alchemist with Chemical Rage can take down Tombstone within seconds. Also Meepo which has benefit from Divided we stand.

Items

 * Orchid Malevolence works very well against a spell caster like Undying.
 * Undying heavily relies on his spells to stay alive in a team fight. The Hex provided byScythe of Vyse makes Undying vulnerable to attacks and spells.

Good against...

 * Broodmother with large number of Spiderlings can easily ensure Soul Rip to deal maximum damage to her and her allies.
 * Broodmother has rather low base strength, thus she is vulnerable to Decay in the early/mid game.


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Others

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Works well with...

 * When enemy heroes are affected by Naga Siren's Song of the Siren, Tombstone zombies will still spawn beside the enemy heroes. This effectively increases the number of zombies in a fight.
 * Ensnare prevents a fleeing hero from escaping, making the hero more prone to zombie attack.


 * Broodmother with large number of Spiderlings can easily ensure Soul Rip to deal maximum heal/damage.
 * Broodmother and her Spiderlings are able to slow enemy heroes with Incapacitating Bite and Poison Sting, enabling Undying and his zombies to catch up.


 * Crystal Maiden's Arcane Aura can solve Undying's mana problem. Undying can have sufficient mana to harass enemy heroes when laning and cast spells during team fight.
 * Crystal Nova and Freezing Field provide respectable AoE movement speed and attack speed slow. This synchronizes well with Tombstone and Flesh Golem.


 * Fatal Bonds amplifies the damage of Undying's AoE spells.
 * Upheaval is a strong AoE slow that can kite enemy heroes from approaching and damaging Undying's Tombstone. Also, Upheaval makes escaping from zombies attack an impossible task.
 * Warlock's Golem can distract enemy heroes from attacking Tombstone. The slow and damage amplification from Undying's Flesh Golem also synchronize well with Warlock's Golem.


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Others

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