I don't know since when the critters in the arena are bloodless, but that makes things extraordinary hard on the vampire. Sure, that was some pretty suboptimal playing I just did, but even disregarding that you're at a severe disadvantage compared to other classes due to having way less ressources from the tiles and no blood in exchange.
I guess this was intended as a nerf for those goddamn bloodmages?
Totally screwed up my run, unhappy now