Unkillable normal mob, and invisible multi-possessed wisp normal mob.

Running through the Matlan Waterways, I realized I was being chased and attacked by a normal mob that, after stopping to try to attack it, realized it was untargetable and unkillable, but it was still capable of dealing damage to me. I am unsure when it appeared.

In the same instance, I encountered Delwyn and the wisp he was hunting instantly despawned despite me not walking into range of it. I quickly realized right after I was being attacked by an invisible normal mob that was targetable and killable, and appeared to be possessed by one wisp from each color of wisps for 3(? maybe 4) wisps in total affecting it. I'm not 100% sure on this, as I had moused over the mob and I noticed there were a lot of different colored titles under it's health bar, but I was too preoccupied with killing it to notice the exact details. It was definitely not a rare mob though.

Attached is an image of the bug report, which also still has the unkillable normal mob in the picture just below my character.

Immediately after I posted this, I progressed slightly further after pulling the lever to drain the next area and I found more of these invisible multi-possessed normal mobs and managed to take pictures of it.



Once I killed this mob, it played the wisp possession animation and another invisible multi-possessed mob spawned, this time with more wisps of different types affecting it.



Just in case, here's another bug report screenshot of the same instance.