Great Will

The Great Will is an an entity or group of entities in the franchise.

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The Great Will is the creator and overseer of the Amala Multiverse.

Megami Tensei II
First mentioned in Megami Tensei II, upon defeat YHVH states that he is only a small part of the entity which rules over infinite universes, and that its vast consciousness will simply recreate his body.

Shin Megami Tensei III: Nocturne
In Shin Megami Tensei III: Nocturne, Kagutsuchi, acting on behalf of the Great Will, creates a Vortex World from Tokyo. The purpose of the Vortex World is to facilitate the death and rebirth of universes, as determined necessary by the Great Will.