[MaxWilson]

Probably not, because 1.) their MR is high enough that you will leech only a fraction of the normal HP/fatigue, and 2.) Vanir are expensive enough to be worth killing even one-by-one without crowd control spells. That is to say, Soul Vortex usually doesn't kill all that many chaff so much as it gives you back fatigue, and against Vanir it will kill even fewer. Not worth the low Prot on Bone Armour.

-Max