Tweaking the Life Draining Weapons

[Turin]

I like the idea. Right now lifedrain weapons are pretty much a nobrainer, with curse you would still stick them on most units, but you would think twice before doing it.

I´d still stick lifedraining weapons on my undead, waterqueens and airqueens, but for most of the other scs I´d have to evaluate if it´s worth it.