Fate/Tower of God - Climbing the Tower with/as Mordred (fanfic)

A self-taught Magus and an avid fantasy reader ends up inside the Tower of God with Mordred's power and with Mordred's soul inside his Ignition Weapon as a result of his wish to the Holy Grail. ... Summary: The Main Character participated in a Holy Grail War and ended up being the final winner thanks to wit and luck, but at the cost of his Servant Mordred. As a result of his subconscious wish to the Holy Grail, he gained various powers similar to those of his Servant, his dead Servant Mordred was restored and took refuge inside his sword, and the two ended up inside the world of the Tower of God, going on another adventure. ... It's a story that I'm casually writing on the side after being inspired. It is mainly a Tower of God story. The only aspect from Fate is the MC and his powers. I wonder what the response and popularity would be like. I also like the fact that the MC's powers here are quite straightforward, and it makes things easy to write.