King Taijitu are large, serpentine creatures of Grimm that live in the Emerald Forest. One is encountered by Lie Ren in Episode 6, who defeated it after a heated battle.
The King Taijitu is one of the larger enemies seen in RWBY, easily dwarfing Lie Ren. Where normal snakes have a pair of large fangs in their mouths, the Taijitu sports many fangs in its jaws, with a long, black forked tongue to boot. It has two halves, a black one and a white one, that are joined in the center.