Moon Rabbit

Moon Rabbits are known as Aristocrats of Little Garden, Highborn of Little Garden, etc. Rabbits can possess a special privilege, like Host Master, but it's called Judge Master. If someone with Judge Master authority serves as a referee for a Game, neither of the participants can break the rules of the Gift Game--, or more accurately, the defeat of the rule breaker is immediately decided. Breaking the rules = Defeat. Rabbits' eyes and ears are connected to the center of Little Garden. That means regardless of a Rabbit's will, defeat is decided, and the Chips can be collected. And if you try to sway the verdict with force, then they self-destruct.

As a compensation to having the rights of Judge Master, there are a few [Constraints] in place. There are more, but the main reasons why Black Rabbit couldn't challenge Serpent God-sama's Game is those three.
 * First. After serving as a referee for a Gift Game, counting 15 days, cannot participate in other Gift Games.
 * Second. Cannot participate without the Host's approval.
 * Third. Cannot participate in a Game situated outside Little Garden.

Known Moon Rabbits

 * Black Rabbit