It's a short journey to the dungeon, and everything is normal. You killed monsters, got treasures, and found a crystal chest with no key… where's the key?

You tried to find the key, but failed miserably. And as your hope slowly flies away, a fly passes by the chest.

And the chest shakes?

Oh c'mon, get away, you stupid fly!

The voice seems to come from the chest. And just as expected; it's a mimic!

No, I'm not a mimic. I'm just a regular chest.

It said that while its identity is obvious.

Okay, you win. I'm a mimic. And please don't kill me. We're chill, yes?