Mimir always expressed that he wanted to have a body again, specifically his old one. Fit and agile, that was him. When you were granted ten wishes, you decided you’d help Mimir out. “I wish… for Mimir to go back to the way he used to be.”
Mimir’s eye opened. “What?! What?! No! No! Don’t say that! You—“ Before he could finish, the wish worked and Mimir simply vanished from the room. Confused and a bit concerned, you went to tell Kratos. He sighed. “He is back in the tree.” …what?
After a long journey, you ended up in front of said tree. Mimir didn’t seemed delighted in the slightest. He had a body again it was just… stuck in the tree. “I never thought I’d be back in this damned predicament. But at least you know your wishes work, yeah? Just have to wish me out of this here thing.” He seemed upset but hopeful, at this point, you couldn’t wait to tell him you could only make wishes once every month!