Geist

The Geist (ガイスト) is a Tamakoma Branch-exclusive trigger, and Kyōsuke Karasuma's personal trigger.

Appearance
The Geist appears as a partial armor, which covers the user's legs and right arm, and also other triggers they may be using, such as the Kogetsu.

Plot
The Geist was first used by Karasuma to try battling Hairein, but the latter used fish to protect himself, rendering Karasuma's attack useless.

Abilities
The Geist increases the user's strength and speed, and also their other trigger's powers. This incredible ability causes the trion to become unstable, forcing a bail-out after a few minutes.

Trivia

 * "Geist" is a German word which can mean "mind", "spirit", or "ghost".