So i start the fight with Fenrir but when he gets to about 75-80% HP he just tunnels underground and never comes back up again. He just tunnels around in a cricle no matter what i do, i have stood still waiting for about 30 minutes but he remains underground. I tried using traps and other things to damage him but nothing works.

I have restarted the game, loaded an older save, tried leaving Asgard and completed some other quests and then came back but the issue happens anyway. I have watched some videos of others playing the fight and from what i can see i shouldnt have to trigger something to make him come back up from the ground so this must be a bug.

Please help!