I just found out that Drain Life and Death Coil are affected by healing reduction such as Mortal Strike. It is a severe bug, since Drain Life and Death Coil in vanilla are DRAINS not Heals. Only in patch 2.3 -Burning Crusade, the Drain mechanic was considered a heal, previous 2.3 it was unaffected by ANY healing reduction factor. Please fix.
Source:
Blizzard Patch 2.3.0
http://wowwiki.wikia.com/wiki/Patch_2.3.0
"Healing reduction effects will now affect all health drain spells and abilities (e.g. Mortal Strike will reduce health gained from Drain Life)."
