Does anyone know how to unlock this chest? The only thing I can think of is the chest in the cliffside cavern, but I tried everything and it doesn't seem to unlock it
The mimic chest in the cliffside cavern. I believe to unlock it in the gallery you need to fail the QTE but then defeat the red slimes afterwards, but I might be mistaken.
If that doesn't work, try interacting with the chest and failing the QTE when you have 50 or less Stamina.