King Taijitu

The King Taijitu  are large, serpentine creatures of Grimm that live in the Emerald Forest. They are encountered seen by Lie Ren in Episode 6, who defeated one of them after a heated battle.

The Emerald Forest
During the Beacon Academy Initiation, Lie Ren is ambushed by the black King Taijitu. He draws his weapons and fights it. He has the upper hand and manages to wound his opponent, but then the white King Taijitu joins the fray. The white King Taijitu disarms Ren, but Ren soon gets up. Ren uses his Aura to defend against the black King Taijitu's attack. He then rips out a fang, uses it to impale the King Taijitu in the eye, then delivers a palm thrust to destroy its head. He then engages and defeats the white King Taijitu off-screen.

Appearance
The King Taijitu is one of the larger enemies seen in RWBY, easily dwarfing Lie Ren. It has two halves, a black one and a white one that are joined in the middle.

The Black Half
The black half is primarily black in color, though it does contain a few speckles of white on its underbelly, as well as some isolated areas along its body. Its color scheme is very similar to the Beowolves and Ursa that have also been encountered in the Emerald Forest. It has large red eyes and a white bony covering with red markings on the top of its head.

The White Half
The white half is essentially the inverse of the black half. It also has large red eyes; however, the bony covering on the top of its head is primarily grey with red markings. Also toward the end of its body, its scales appear to have of checkerboard design of grey and white, before turning black and white, then turning completely black as the other half begins.

Trivia

 * Taijitu is a term that refers to the concept of Yin and Yang. It is used as the symbol of Taoism.
 * Taijitu (太極圖) roughly translates to diagram of supreme ultimate.
 * The "King" in their name may be a reference to the real-world King cobra, the world's longest venomous snake.
 * Another meaning for "King" might be that this one was exceptional in size compared to others.  Much like Ursa Major and Greater Nevermore.