BF quests monsters and items are randomly distributed on the third levels of the dungeons. Getting 3 bosses in the first dungeon is not likely, but is certainly possible (10% chance, given 3 bosses and 3 locations). Return near the end of the act and you should do better.
The act 1 summoning doll can equip a crossbow, so can be good support for tough fights (if kept out of melee range, since the dolls are not very tough even if you upgrade them). It is available as a quest reward for helping the poisoned imp, on the level after you jump down the pit in the arena; if you missed it, you can get back after you work your way through enough to get access to the citadel.