The “Diabolic Ritual” talent from the Diabolist hero talents summons a pit lord, mother of chaos or overfiend. The overfiend is the only one who will attack your main target, the other 2 attack the nearest target.
This is absolutely terrible in PvP because many classes spawn temporary pets or just have regular pets. These pets soak up all the damage the Diabolist pets do. It feels absolutely terrible when you see your pit lord shoot all the bolts of damage on a random pet. They should all behave like the Overfiend and attack the player target.