During the Jedi Civil War, a ship carrying Bastila Shan‒a Jedi with the rare and powerful battle meditation ability‒was shot down by Darth Malak's fleet over the world of Taris. Malak's troops descended on the world in search of Bastila, but she avoided capture with the help of Revan, Malak's redeemed former master.
Rather than permit Bastila to escape, Malak ordered his fleet to bomb Taris from orbit, devastating the entire world. The planet-wide capital city was razed and civilian casualties measured in the billions. Despite Malak's extreme efforts, Bastila and Revan were able to safely flee the world. Taris itself, however, never recovered. Three centuries have passed, and a handful of swamp-sunken ruins are all that remains of this once great civilization.