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)

Monk

• [Rising Sun Kick] (Windwalker)

Rogue

• [Wound Poison]

Warlock

• [Legion Strike] (Felguard ability)

Warrior

• [Mortal Strike] (Arms)

Classic

• [Hex of Weakness] (Troll Priest racial)

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