I was clearing the Bloodguards looking for quest pieces when all 3 of them popped on me at once. This was in the northern most room north of the pit trap. It was the 3rd time I had cleared the area and they had not popped before. Not sure what the trigger is or even if there is one. They all dropped between 70-65pp.
Pull a Bloodguard from the Bloodlords room and was fighting in the hall. A supplier came out of the Seer room and attacked me. Killed both and pull the second supplier which is a double pull with a bloodguard. Killed both and the third supplier had despawned by then. One dropped 70pp and the other 67pp. Was kind of fun with the double pull)
Me and my Necromancer friend were camping the defender when these guys popped. THey spawned not in the defender room but in the first room to the left if you go down the hall from the defender. WHen they spawned all 3 spawned at once and I'm guessing they despawn if you leave them up long enough. They wre nothing fancy to fight but dropped 60-70pp each $$$
Also dropped one of those cash items belt buckles. Once a nice surprise gift 8)