The Basilisk war droids were a fearsome, heavily armored four-legged droids used by the Mandalorian Crusaders. According to the Qel-Droma Epics, at one point in time, the Mandalorian Crusaders served under the command of the fallen Jedi Knight Ulic Qel-Droma out of the Iron Citadel on Empress Teta, and rode Basilisk war droids into combat. 
Behind the scenes
The Basilisk war droid first appeared in the Star Wars Legends comic Tales of the Jedi – The Sith War 1. It was a semi-sentient droid that the Mandalorians used to successfully conquer many planets during their crusades.
- Nexus of Power (First mentioned)