[Chaos]

Life Drain might look great on paper, but it forces the user into a risky attrition game. Believe it or not, this skill is actually suicide against glass cannon archetypes, due to their typically low HP; it will only work well against tanky builds. (It may also work as a finisher skill, provided that going into melee range is a plausible tactic)

It's also a vital piece to keep a cornered Lich alive, given their crippled HP and all.

That all being said, in the absence of detailed examples, I'd say to just leave Life Drain as it is.