Unknown Hero (Fate Grand Order x Male!Servant!Reader)

They say that the continent of Mu was a myth yet it's still unknown if there was really a continent of Mu.

But the truth of Mu does really exist, for only the whole land swallowed up by the ocean or crumble from massive earthquakes as volcanoes rises and shrouded the whole land.

In that land lies a Hero that died with his people till the very end. His name is (Y/n) (L/n), King of Mu. The very first hero.
(Don't even say it, that cocky fool doesn't deserve to be the title)

After his death, he became a heroic spirit but none of the mages of the holy grail war manage to summon him. Not until a fateful day, where his destiny occur. Bringing (Y/n) into the world as a servant.

Disclaimer: I do not own Fate Grand Order nor any characters or pictures.