So i found a bug....
I was running Amber temple last night on heroic elite on G'land as an abyssal pact warlock and i progressed the quest to the optional fight in the small room with kasmir. the ex rogue/bard/pally/sorc fight. i cleared out the trash mobs but the ex- _____ mobs werent dying or even damaged and that's when noticed green numbers with the nullification damage symbol next to it rising up from the ex rogue etc. mobs. and i was like "well $h*t that aint supposed to happen." So I turned pact damage off and proceeded to wear down the mobs like i had the rest of the undead in the temple. all the other undead I've run up against to this point haven't been healed which is WAI.
I just have to say that i am now on my 16th reincarnation as a warlock (i am running racial lives as a warlock) and i am, for the first time, running abyss pact. so far up to level 11 it hasn't impressed me very much. @ 12 i am going to switch over to ES tree and maybe it might improve. Hopefully things will change when i reach 15-17 and get better gear and spells? time will tell.