My VW's Scythe gets + to dmg vs them. They are also weak to my Life Taps. Very easy to solo OJ and that was with a blue scythe and armor. 3 LT, DoT and melee. Hardly ever dropped below 50% HP.
They drop stackable gems so loot is nice. Respawn is odd though and to pull the side room you have to basically stand in the opposite alcove.