Basilisk was an Imperial I-class Star Destroyer. Captain Mullinore was in command, and the vessel was part of Admiral Natasi Daala's four- Star Destroyers squadron. Like the other ships in its class, this warship was originally assigned to protect the highly classified Maw Installation. However, when Daala initiated her campaign of guerrilla warfare against the New Republic, the Basilisk suffered significant damage. This damage occurred when Kyp Durron used the Sun Crusher to detonate the Cauldron Nebula.
Following the destruction of the Hydra, Daala gave the order for the Basilisk to pursue the Sun Crusher, which was being piloted by Han Solo and Kyp Durron. It became entangled in a conflict between Moruth Doole's forces from Kessel and the Millennium Falcon. During this engagement against Daala, the Basilisk sustained considerable damage.
The Basilisk later participated in operations against a New Republic colony located on Dantooine and also took part in an assault on the Mon Calamari homeworld of Dac. It was during the latter that its sister ship, the Manticore, was destroyed in battle.
After the aforementioned conflict, the Basilisk and Gorgon retreated back to the Cauldron Nebula. There, Daala conceived a plan to crash the Basilisk into the surface of Coruscant using a minimal crew. However, this plan was thwarted when Durron arrived with the Sun Crusher and caused the nebula to go supernova. The resulting explosions engulfed the Basilisk. Fortunately, the majority of the crew had been transferred to the Gorgon, leaving only a small number aboard when it was destroyed. Notably, aside from Captain Mullinore, the crew members who perished in the supernova were all Stormtroopers.