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I call it a "Tenta-box"
At first its just a box or small chest with a crank.
It will buff enemies and it has a lot of health but no attack.
You can take a party member's turn to turn the crank.
The box opens randomly between 1 and 3 cranks.
The open box has a little creature that has a weak attack and less health than the closed box.
There is a timer when you open the box, and if you fail to kill the creature before the timer runs out the Tenta-box is summoned.
This form has medium health but very strong attacks.