The hypothetical final avatar of the Great Divine Will.
The Great Divine Will created avatars to represent aspects of his nature, pitting them against each other to test which reason is the strongest, shaping all of creation around the results.

The End is the hypothetical final avatar, unleashed upon all of creation to annihilate everything and all may all previous avatars fail.
It is build to destroy and is exceptionally efficient at it. Is The End truly unstoppable...?

The End is not sentient. It is created purely to destroy absolutely everything and self-terminate once it has succeeded.

While the Great Divine Will is an ultimately benevolent force and the de facto creator of the world, he is just as flawed as everyone else. Struggling with inner conflict, it is within reason that he may choose to end all of his creation when he loses hope.
His current favorite avatar is Luna, who represents hope, so luckily it seems he's still far removed from resorting to The End.

The End's design incorporates many elements from various characters: Insipid, Death Mephistopheles, Vilunis Malaris, N-V, Beëlzebub, Devile and Asmodeus.
It also seems to be both Celestial and Infernal.

How the heck do I even tag this? x.x;