Cu Sith (pronounced Coo Shee) is a giant otherworldly dog which haunts the Scottish highlands and fairy mounds. It is said to be roughly the size of a horse and have shaggy green fur with a long often braided tail.
Cu Sith, though capable of hunting silently, would often let out three terrifying barks, which could be heard over long distances. These three barks would herald the coming of Cu Sith and warn farmers and sailors to lock up their women at night, lest the great hound come and snatch them away to supply milk for the fairy children.
"A fairy of Scottish legend that takes the form of a dog. Roughly the size of a calf, it is kept by the fairies as a guard dog. Because it can walk without making a sound and can understand human speech, the fairies often use it as a mount. The Cu Sith has dark green fur, legs about the size of human legs, and a long, curled tail. It glides soundlessly when it walks. The Cu Sith is usually accompanied by fairies, but sometimes goes out alone. When it does so, people must find shelter before Cu Sith barks three times, or they will be killed."
One of the members of the Tribhvana, Tribhvana:Air, transforms into a Cu Sith during a confrontation with the party. He will buff his fellow Tribhvana members and debuff Serph's party. They are first encountered on the 20th floor of the Karma Society Tower.
The Tribhvana try to ambush the party again on the 32F of the tower, although not much has changed since the first encounter. They have more HP but also have access to an enemy combo when all three are active which deals heavy electricity damage.