Just had my first game with daemons and used a Bloodthirster.
Reason for this guy is because i have taken a Keeper of Secrets and i do not fancy this guy as my warlord.
I've taken two greater rewards on the Bloodthirster; i got it will not die and the 3+ armour save, so i took that funky blade of blood which gives the rampage rule.
The Bloodthirster had already killed four Ravenwing bikers via vector strike and now targeted a ravenwing command squad, which has had a Libby and Sammy attached. The Bloodthirster killed the dakka banner via precision strike and murdered the rest. Only sammy reminded on two wounds, sammy went down soon after.
After butchering the ravenwing command squad the bloodthirster picked on an attack bike and smacked it silly.
The bloodthirster killed a about 660 points worth of ravenwing! That's over double points back and over a quarter of the enemy army!