Metaxi Tau, Queen of Great Hive Tau.

Hidden deep in the ruins of what was once a Diamond Dog colony, Great Hive Tau remains enigmatic to the ponies of the nearby Rockville. Many residents would be surprised to know such a hive even existed at all, such is the degree to which Tau hive seeks to hide its presence from the world, though local diamond dogs from the hill top fortress, The Woofsden, commonly share stories with travelers of the mysterious swarm.

What Tau's master plan, if it even has one, isn't known to any but it's Queen and its lords whom serve her. Only time will tell.