Tro was the first planet and cosmos visited by the Daban Urnud after their first attempt to travel back in time resulted instead in a trip to Tro. The Advent of the ship at Tro caused much chaos, but eventually a large contingent of people from Tro joined and helped refit the ship. Those of Tro are most closely aligned with the Urnud on board in the Pedestal. From Tro, the ship next visited Earth, then Fthos and Arbre.

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