Form VIII: Crush-u was a lightsaber combat style which came right after Form VII: Juyo/Vapaad/Assrape and just before Form IX, which didn't actually exist. Darth Sorrow developed the style, which incorporated vicious and powerful strokes with treacherous rock slides to compensate for his sheer size and immobility. The most famous user of this form was Darth Vader, who used it on Bespin to chuck stuff at Wormie Skywalker while owning his ass by hitting Wormie with his Ultimate Weapon. Both users of this boss form somehow died to weenie Jedi.