A Holy Knight Digimon. Craniummon is a colossal undead knight-like being, but despite its appearance it is in fact one of Yggdrasil's most loyal servants. It wields a massive double-bladed broadsword named the Duo Solar Spear.
It is a member of the Royal Knights, and carries the title of "Holy Knight of Loyalty" (忠誠の聖騎士, Chuusei no Hijiri Kishi).
Craniummon is referred to as Craniamon in English material.