Grimm Damashii (グリム魂 Gurimu Damashii, lit. "Grimm Soul") is an alternate dark green author-based form of the based on the Brothers Grimm, known individually as Wilhelm and Jacob Grimm, two late 17th and early 18th century German writers. This form bears the Persona Fairy Tale (ペルソナフェアリーテイル Perusona Fearī Teiru). In this form, a Kamen Rider can use the G Pen (Gペン Jī Pen) on their shoulders for offensive and defensive attacks. While it is mostly used by Kamen Rider Necrom, it can also be used by other Riders.