I'm not particularly interested in playing the Dark Urge, but I think it's really neat to be able to play a character with an added narrative layer. It's like having a second background called Serial Killer.
I do wish it had been an additional companion though.
I'd rather have the additional companion ( read: Helia) than another angsty emo stuff - we have enough with the other origins already. Why can't Larian do normal for a change?
