LostSoul
Adventurer
The dragon's repeated observations on V's affected sense of aim seems to suggest that it will succeed in its threat, and that V will then suffer enormous guilt at ablating his own abilities to the point that his children were killed because of it (I'm tired of gender-neutering V and will henceforth use the male pronoun!).
I think it's worth noting that V missed because of his guilt. (He can't Trance and that's what's causing him to miss so much.)
I wonder what game system would be best to bring about this sort of thing in play.