Tír fo Thuinn is often referred to as "Land under the Waves" by mortals. They're half right. The area was much larger centuries ago. From the north came a towering wall of water that buried half of the land, dredged new channels and displaced large amounts of earth.

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  It is a hearty, chilly place where the sturdy and self-sufficient thrive. Countless members of the Fianna chose Tír fo Thuinn as their otherworldly home after their passing from the mortal world, serving as the unofficial wardens of the land.

  Several high commanders--many of whom are ancient descendents of the Tuatha Dé, Aos Sí--have fallen under a curse of late that risks the safety of all who live here.

  Whereas much of Tír fo Thuinn fell under the Great Wave, Tech Duinn grew. The water separated two villages from Tír fo Thuinn, and the force of the waves moved mountains and hills until the villages shared the same land as the master of the dead, Donn.

  The locals on both sides of the new channel adopted the name of Donn's stronghold, Tech Duinn, as the name for the reformed island.

  The cause of the Great Wave was lost to time.