Reduced healing

A number of Player abilities and talents cause reduced healing debuffs that reduce the effectiveness of healing by a certain percentage. They are sometimes known as Mortal Wounds debuffs, after the Warrior's effect.


 * Demon Hunter
 * Mortal Dance (Havoc PvP Talent)


 * Hunter
 * Monstrous Bite (Devilsaur ability)
 * Widow Venom


 * Monk
 * Rising Sun Kick (Windwalker)


 * Rogue
 * Wound Poison


 * Warlock
 * Legion Strike (Felguard ability)


 * Warrior
 * Mortal Strike (Arms)
 * Wild Strike (Fury)

NPCs
Some other sources of reduced healing effects (particularly by NPCs and Bosses) include:


 * Curse of the Deadwood, cast by Deadwood mobs in Felwood.
 * Gluth's Mortal Wound
 * Watchkeeper Gargolmar's Mortal Wound

These boss abilities block healing completely:
 * Chimaeron's Mortality
 * Blackwater Behemoth's Darkest Depths
 * Helya's Dark Hatred
 * Hungering Destroyer's Hungering Destroyer

Healing dealt
There are also debuffs that reduce the effectiveness of healers to heal others.


 * Anetheron's Carrion Swarm