Demiourgos

Demiourgos (デミウルゴス, Demiurugosu, lit. "Demiurge" in Latin), also known as its weaker form Abraxas (アブラクサス, "Aburasakkusu") is first introduced as a Menos Grande-level Hollow, but during events at the climax of Part III, due to unknown reasons as of yet, Abraxas transcends its kind and becomes a living distortion that threatens Soul Society, Hell, and the World of the Living. Abraxas then goes on a rampage destroying anything in its path including Shichitenhakki. It overpowered Mitsuru and Agito and their comrades until Gai, back from the dead, arrived to help and destroyed it. After Seireitei is destroyed and Abraxas survives, it merges with the King's Key to form Demiourgos. Demiourgos was able to overpower the opponents it fought easily. Fortunately, Gai unleashed his Anteishi Setsura form through the collective wishes of his friends and destroyed Demiourgos once and for all.

Appearance
Of what little is seen, Demiourgos is a giant shadow, based off the Brocken Spectre. Its formation involves thunderclouds coalescing initially into a giant humanoid and then it forms a mountain-like shadow. Its size dwarfs Seireitei and Rukongai, and it even touches the clouds in the sky. The lower part of its body is an innumerable amount of shadowy, black tentacles.

Powers and Abilities
Cero:

Enhanced Speed:

Tentacles: In both forms, Demiourgos employs the use of tentacles, which are usually utilized to ensnare its foe and pull them closer into its grasp. The tentacles' grasp is impossibly tight; both Gai Nagareboshi and Agito Kishima have been unable to break free from them; and required to be saved by a third party. In addition, these tentacles are coated with a slime that immobilizes the body parts which are ensnared by paralyzing them. For offense, both Abraxas and Demiourgos are able to grow razor-sharp spikes from the ends to pierce their opponent.

Teleportation: