+1: The burning chain isn't lost if you kill targets by deathgaze.
And I just noticed I haven't even answered a question for months
1000 sorry. The limitless lifesteal still works, and all you need is to have at least 1 lvl of lifesteal on a gorgon, and kill a bloody monster with deathgaze. When you do that, you get maximum health out of it, even if the monster was down to 1 HP.
What Avatar described was the extreme version of it, which exploits corrosive creepers' blood.
If I managed to overlook a question again, feel free to remind me in a PM. (Oh and the continuation of my infinimuter topic is still coming, I just had a summer job that drained my energy and I couldn't motivate myself to write it. From Monday though, I'll have time again.)