After defeating Umbraxakar -I had to reset/die once due to killing him too fast- he is now laying on the ground and I ahve the quest objective "Free Glyster with the Amulet of Selûne" but using the amulet does nothing and the quest marker just leads into a wall.
I also completly abandoned (and aborted) the quest and when I took it again, I was at the exact same spot (as in quest progress) with Umbraxakar already on the ground
2
Comments
https://arcgames.com/en/forums/neverwinter#/discussion/1246769/shadow-dragon-killed-cant-progress
"We were able to go back and do this again tonight. We killed it too fast the first time, but got it done the second."
https://www.youtube.com/watch?v=XGcPPNwhz6w