Namharim, Born of Night. Invisible during add phase, cannot kill him.

Hello,

I encountered a bug where I phased Namharim, Born of Night to fast during a sacred grove encounter that caused him to bug out.

I played on my BV fire assassin that does big Herald of Ash explosion damage.
When I started the encounter basically all the mobs exploded and put Namharim into his add phase, he was invisible and could not be attacked, but adds kept spawning, after a few minutes of killing adds I gave up.


I did a little recording of him being invisible and spawning adds if you want it, I can upload it.