Fate/Book of Aaron

Aaron, a modern-day man who finds himself transported back in time to the era of Jesus' disciples. Renamed by Jesus himself, Aaron becomes the 13th disciple, but his mission is unlike that of the others. He must fight the Lucifer and die with Jesus on the cross. Tasked to save humanity from Demons, Types, corrupt grails, beasts of humanity or rogue servants. Alone he exist in the throne of humanity. “You wont be able to summon me using the throne of heroes. For which he said so and yet to come. Humanity must continue in order for the promises and prohecies to be completed.” The wandering servant that sees humanity and loves it.