B4 saber battle droid

The B4 Saber Battle Droid was the droid creation of the Gishi CIS captain Lack Toler. Toler introduced his Lightsaber wielding battle droid to the republic in 20 BBY on the small moon of Ootoo IV, where he pited the first two prototypes against Jedi master Doola Karnt. Doola destroyed the first droid, and her clone commander, Commander Res, destroyed the second one. After Toler escaped prison he went back to CIS head quarters to redesign the saber droid.