Help a quest is broken

Hello I need help the hero of gavel quest end is broken and I have tried /class /lobby and leaving the server I had to do the last part solo and after entering the guizer I hit the ground too hard and died so I had to walk there and now the final NPC will not show up please help.

 

I'd recommend submitting a bug report. I'd say there's a good chance that if it did happen to you, then when a hotfix, patch or major update releases and fixes the aforementioned bug, you can just head back to the siegfried cave and progress the quest. However, there's not much you can do right now regarding the in-game stuff, so I'd recommend just waiting until one of the 3 things I mentioned happens.