I, the Church Priest, Gain Power Through Faith!

Hell is empty, and demons walk among us.

The nations of Middle-earth are divided among rival powers. While feudal lords within each country wage war against one another, demons from Hell have also entered the fray.

A good young man from the twenty-first century becomes Charles, an elderly priest at a small-town church. At the age of 76, he obtains a System that rewards him whenever he performs actions befitting a priest.

[You killed a lord who had turned into a demon. Received 1 magic scroll]

[You braved the plague and helped XX people suffering from black leprosy. Received 3 gold pounds and 1 attribute point]

[You killed a cursed knight. Received 2 sets of heavy cavalry armor]

When Charles sees a pile of children killed by the demons of Hell:

[Your heart is filled with rage, and your hatred for demons reaches its peak. Received a Mythic Weapon: Hammer of Divine Retribution]

When the age of the Church comes to an end, and Middle-earth is completely engulfed by war and the depredations of demons:

"I! Charles! The Lord's most faithful servant! In the name of the Lord, I declare... a holy war, an expedition!"

At humanity's darkest hour, a figure in white tears open the darkness.