Amyleii
literally a child
One man cursed with eternal life, one man granted it. Both bored in their eternity together. They have acquired the grail together In a stalemate of underage and have started something to break their unending tie for their Holy wish. A new type of tournament. Two sides, chosen by the grail, to be imbued with the powers of a servent. The only masters are Gilgamesh and Caine. (Basically instead of summoning servants the grail grants their powers to random humans and they must fight in a tournament for one of the two servents who won the latest grail war through stalemate. Gilgamesh or Caine. Neither can die so the grail can not choose a winner.)