NxyuTheHarpy
Two gods, the God of Angels and the God of Strength, ruled over the Afterlife. Strength noticed Angels' wicked ways and confronted him, and then was promptly banished to the Underworld. Strength became corrupted and powerful, so over several centuries, Angels attempted to limit his power, taking his magicks and dispersing it across a selected planet.
The creatures there evolved with the magic and eventually kept it after natural causes of death, making the fallen God angry. Strength confided in a sorcerer and managed to get a loophole made. If one of the magic races, monsters, loses their hope or will to live, they Fall Down. Strength can then steal their magic and turn them into daemons, creatures animated by the dark God's twisted magic that can inhabit the lifeless husks of dead monsters. They only listen to the dark god.
After a while, a team was assembled to erradicate daemons, and soon a school as well. There, a certain monster enrolled in the classes...
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Unholy is mostly about Sans and his journey through the Daemon Extraction Force (DEF) Academy with his daemonic abilities, struggling with the world profiling him as well as issues from the God of Angels. There will be romance too.