In its base state, the Tentacle Grimm appears as a small skull-like creature, with three pairs of eyes, a pair of horns, and several tentacles. The tentacles can extend longer than usual, possibly to grab targets.
Powers and Abilities
The Tentacle Grimm appears to be not quite powerful by itself and relies mostly on sneak attacks. It can use its tentacles to attack its targets.
In Chapter 11 of the manga, it merges a group of four King Taijitus into one large, eight-headed snake. This fusion makes the King Taijitus faster and stronger. The ability to merge Grimm leads Weiss Schnee to conclude that it is a possession-type Grimm. Unlike Geists, it is able to possess organic matter.
It then appears in Chapter 11 observing Team JNPR fighting four King Taijitu. It is briefly spotted by Jaune Arc before fusing with the four serpent Grimm, making them become one large creature. In Chapter 12, Team RWBY arrives, and Jaune tells RWBY and his teammates about the Tentacle Grimm. In Chapter 13, they come to the conclusion that the Tentacle Grimm is the weak point and devise a plan to distract the King Taijitu heads so one of them can attack it. In Chapter 14, Weiss increases the muzzle velocity of Crescent Rose, allowing it to fire a bullet that pierces the Tentacle Grimm's mask. The King Taijitus begin crying out and squirming, as if in pain, and Teams RWBY and JNPR are able to slay them.
- The eight-headed creature that the Tentacle Grimm creates by fusing the King Taijitus is a reference to Yamata no Orochi from Japanese mythology.
- Blake Belladonna takes this reference further by mentioning a story about a sword that is found within an eight-headed snake. The sword that she is referring to is the Kusanagi no Tsurugi, which was found in Orochi's tail.