Comment by Housebread on Unrivaled Gamer: Dominating With the Ex-Skill Hero Master - Chapter 6

never actually seen the Fate anime or played the games but I read a LOT of fanfic so its impossible not to see the connection here. 

Cradle of Valhalla - throne of heroes 
Heroic spirit - Evil spirit.

Im guessing, that the end game goal for beating the castle is gonna be a Wish.