The Mu is a Beast/Dreamhare-type enemy from Final Fantasy XII. It can be found in the Feywood. As it frequently casts Confuse, it is not a foe to be ignored even if the player party is of a much higher level.
The curious mu makes its home in the ancient trees of the Feywood. Their nests are made by boring holes in the tree trunks, whence they peer out to watch for danger. Spending all of their waking lives beneath the shade of the trees, their bodies are pale and colorless. So close is their affinity for the trees that some communities consider them to be tree spirits.
According to the chronologists, the creatures known as mu came as emissaries from the moon, and were once revered as sacred beings. Thus is the dust they guard with their lives though to come from the moon itself. Indeed, this moondust is markedly different in nature and composition from most similar sands found here in Ivalice.