Hi
When I play in groups with Falconer and he summons a new Falcon, my Wraith Lord begins targeting that one without dealing damage.
The same goes if someone else than me summons an Ice Beetle from a Pylon or a new mini “minion” enters like bees or maggots, that were not in the zone to begin with,
I can move out of range of the entity, and my Wraith Lord will again target normal mobs, but when the others comes into range again, it prioritises those targets again.
This makes it impossible for me at the moment to play in groups. 
/Martin Madsen