The KeyBlade Wielder in Fódlan ( Kingdom Hearts X Fire Emblem Three Houses)

Somewhere far away Y/n L/n a Oath Keyblade wielder who made a oath to himself to protect the light from from the darkness. It was then he landed in Fódlan and was killed. It was then his heart, body, and emotions were gone so he then locked the world from the darkness. It was then over years the three parts of Y/n broke the door to Fódlan and creatures of Darkness came. Y/n was weak and resting so he then use Byleth to help stop his three dark forms of himself. Will Y/n protect Fódlan from his three vision of himself of darkness.