Ment
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An unknown force pushes Tsukiko away from the door, and the key breaks in half.
Well, it seems that the barriers won't let you break into the system so easily.
But I was also thinking about this... What if a character entered alone? It's unlikely, but possible. The emperor didn't have the seal, but how did the emperor get into his palace? Maybe we need to use what's available in the room. There's a skull among the movable objects. It would look strange, but... poking around in the eye sockets with a knife, putting it in the helmet on the chair, and so on.
Anyway, the Heroes player is also in a difficult situation, we need to help him out.