The Skeleton bonus round rule is one of the many rules that can be applied during the Bonus Round episodes. It generally spawns around floor 4 or 5 for the Warrior, Thief, and Inventor only. The rule does not appear for the Witch and Jester since the rule can just leave them with two dice, and the Robot rolls dice using a CPU counter instead of getting a set number of dice. The rule cannot appear at the same time as the Scathach Bonus Round rule, since curse usually makes you lose a dice anyways.

Skeleton

Lose a dice.

When the rule activates, the player will permanently lose a dice, leaving them with fewer dice to do their attacks. This makes equipment that gives more dice more important when the rule is active.