The Eminence in Shadow Light Novel 2

NOTHING COULD BE FURTHER FROM THE TRUTH
Cid pays a visit to the Sacred Land, where he finds himself getting roped into the Goddess's Trial. It's a ritual event that summons warriors from the past to engage with only the most worthy from the present. When Cid squares off against the witch who brought devastation to the world, the door to the Sanctuary creaks open, granting the Shadow Garden valuable insight into the possessed and the Cult of Diablos. That is until Cid, blissfully ignorant of the conspiracies playing out behind the scenes, runs amok!