After transmigrating into the world of Naruto, Xuan discovered that he had awakened a Corpse-Touching System.
He could grow stronger just by touching corpses!
During the Third Shinobi World War, he touched the corpse of the Third Raikage, who had died in battle.
From then on, Uchiha Xuan began his enjoyable life of touching corpses.
The Fourth Shinobi World War.
Third Raikage: "Why can a Konoha shinobi use my Strongest Spear and Strongest Shield???"
Second Mizukage Gengetsu Hozuki: "What, you even know my 'Yoshi, yoshi'??"
Madara: "That bastard's a grave robber! He even dug up my tomb!!"