Great Will

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

Profile
The Great Will is the creator and overseer of the Amala Multiverse and a being often associated with YHVH.

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. In the meantime, the entity will send other avatars to avenge His death, promising the hero that he has ensured the harshest path for humanity's future.

Shin Megami Tensei II
YHVH again references the Great Will after being slain by Aleph, promising that as long as humanity believes in His salvation the Great Will will revive Him over and over.

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.

During the Labyrinth of Amala sidequest, Metatron appears on the Great Will's behalf and tries to deter the Demi-fiend's progress, and is described by the demons of the Labyrinth as having the voice of the universe.

Shin Megami Tensei IV
While not directly mentioned, Lucifer states that people's thoughts are responsible for creating the Expanse, and that similarly humans are the reason that entities like YHVH will never disappear, suggesting that the Great Will, the Expanse, and the multiverse's collective unconscious are somehow linked.

Known Avatars

 * YHVH
 * Kagutsuchi
 * Sabaoth
 * Shaddai
 * Elohim
 * Ancient of Days
 * Metatron

Trivia

 * It is mentioned that Catholic Churches are specific places where people worship the Great Will in Devil Summoner 2: Raidou Kuzunoha vs. King Abaddon.
 * Canopus acts as an alternate equivalent to the Great Will in Devil Survivor 2.