Assassin's Creed: Magus

"The silence did not smell of ash, nor of molten metal. It smelt of ancient wood, lavender, and beeswax."

When Yuto Emiya reopens his eyes, his war was over. The Holy Grail was reduced to ash, his Magic Circuits are nothing more than inactive ruins, and his old life in Fuyuki has collapsed. He has no magic left to invoke, no Reality Marble to summon, only a real sword, a gun with nearly spent ammunition, and a body condemned to a silent immortality by the everlasting warmth of Avalon.
Yet death has chosen to reject him, casting him into a radically different world: Florence, 1455 AD.

Amidst the dark intrigues of bankers, the lethal conspiracies threatening the Auditore family, and the hidden blade of the Master Assassins, Yuto will discover that his nature has not changed. Beneath a sky of red roof tiles and plots, old enemies give way to new tyrants to be fought in the shadows. And when the Creed whispers that "nothing is true, everything is permitted", the last heir of Camelot will find a new Brotherhood to defend until his last breath.