Mu are small, burrowing enemies with a bushy tail and large claws on their forelegs. When the player gets close to a Mu, there will be a rumbling noise and a brief moment where a dirt cloud forms on the ground, then the Mu will pop up from beneath the cloud. They use their claws and their tail to attack, with their tail attack interrupting any focus attacks or spells being cast. They are not very aggressive, and will not chase the player very far if one runs away. Mu can be found in the River Belle Path in all cycles.