Quote Originally Posted by 'Powerwar',index.php?page=Thread&postID=183263#pos t183263
The problem will be trash rather than bosses using a drain tank because it requires good tmining and watching lots of debuffs.

With spell damage (instance and quest rewards gear) and this build drain life is really killer spell recovering about 1k HP /sec while also damaging the mob meanwhile as long as the 3 instacast dots are up. With better gear it only goes more insane.

This is how drain tanking works (no voidwalker, the warlock does it all):
http://www.youtube.com/watch?v=ziPQ8ukpuLA

Note what happens to the warlock HP after he hits drain life (the green beam)
Yeah sorry that won't work - warlocks aren't going to have defense gear so they'll never be uncrittable, and there are plenty of heroic bosses that can crit for easily 15-20k per hit. Doesn't matter how much drain life gives you, 2 of those in a row will kill any warlock.