Geist

The Geist is a Creature of Grimm resembling a ghost-like creature capable of "possessing" inanimate objects.

It made its first appearance in "The Next Step" fighting RNJR.

Appearance
The Geist's true form is covered in bonelike spines with long, skeleton-like forearms and sharp fingernails. Due to its ghostly appearance, it lacks a lower body, instead floating through the air while leaving behind a black smoke trail. Its face consists of Grimm markings on a bone plate with a single eye.

Powers and Abilities
The Geist is a possession-type Grimm, being able to control any object it possesses. It is able to regenerate lost limbs by possessing another object in the vicinity and integrating it into its body. Its only real vulnerability is its "face", the central segment where its actual body is located. All of its limbs must be destroyed at once in order to expose this vulnerability.

The specific Geist faced by Team RNJR in "The Next Step" possessed a number of large boulders and a tree, which were virtually immune to slashing attacks, as well as elemental lighting and fire Dust ammunition.

This Geist's limbs were not connected physically to one another and were held together by an invisible force that seemed to have no difficulty moving massive objects. Most of its attacks utilized its enormous mass and size in brute force attacks, though it also displayed the ability to use discarded pieces of its body as projectiles.

Once its host object is destroyed or severely disabled, it abandons the body, revealing its base form. The Geist has yet to demonstrate any combat abilities in this form, which was killed with a single shot from Crescent Rose.

Trivia

 * Geist is a German word meaning "ghost", or depending on the context, "spirit" or "mind".