A screwdriver would work if you can't find a knife in the kitchens. There should be at least one in the artificing shed. Anything you can use to damage the brain will work.

I tried stabbing him multiple times on his body and he kept fighting until I stabbed him through the forehead.


I'm sorry about Phin. Anon said Brother will fix all of this and make it so it never happened and I believe in them. If we find the pieces and restore his heart, Brother can undo everything and Phin will get his feelings back.