Due to his harp teeth, claws, and speed, Basilisk survived the war. He was sent to different worlds where the Sith were losing and was unleashed on the Republic troops.
Basilisk as captured by them and served them for several years before their disbandment. The Sith Empire was an empire of Sith Lords who fought the Jedi Order and the Galactic Republic. Basilisk was first seen serving the evil Sith Empire during the Great Galactic War.