i think it will work, the karmic blast has cut through supposed invulnerability before and that attack harms the soul directly, and the soul-suck is a much stronger attack.
anything with a soul is fare game for the soul gem, and any soul can be altered permanently that is why warlock tries his best not to use it often.
Originally posted by OualladaThe scan says G has no soul, but he does have a spirit [on the level of Eternity/Infinity]. Apparently the 'infinite' power of the gem can't affect a being's spirit? Stupid.
Is G even supposed to have a spirit? I mean, cosmic entity, abstract force of nature and all that.