Legacy of the Abyss.

When the deity that kept Earth sheltered from the eldritch terrors of the abyss is finally slain, the unprepared planet is thrown into a world of mysterious powers, terrible creatures, and death. Lucius, a 15-year-old young man who ran away from an abusive family, leaves behind his world of struggling for food and shelter on the city streets, only to struggle anew against the teeth and claws of horrifying monsters that possess strange and fantastic abilities.