Kamui

Kamui (カムイ) is a weapon made by Gantz Storf. It is a customized dagger specially made for Rein Shroud which is exclusive in use to himself.

Description
Kamui is a fiery red dagger with slight warps. On it, there is a special pattern which is a trigger installed on the handle. This trigger enables the dagger to acculumate the power of Rein's contractuals that can create destructive powers. To activate this gimmick, a contractual along with Rein have to hold the dagger's handle.

Trivia

 * This is the second personalized weapon made by Gantz Storf and given to Rein Shroud.
 * Gantz considers Kamui one of his finest works.