The Holy Clavis

4-5 The Holy Clavis is the final leg of the main quest in the Dead Dunes in Lightning Returns: Final Fantasy XIII. After viewing all murals inside the Temple Ruins in "Murals of the Gods", the player gains the means of opening the sealed door that leads to the holy clavis. Fang will leave the party at the conclusion of this quest, and so if the player wants her around for anything else, they should hold completing this part of the game.
==Quest log==
;Entry 1
:Lightning and Fang have seen the three murals. They have the three pieces of the crux, and now they can open the Sacred Gate. Soon, the holy clavis will be in their hands.But the Order is closing in on the treasure as well. The pair will have to hurry to the chamber if they are to claim the prize and keep it out of the Order's hands.
;Entry 2
:For the first time in centuries, the door to the chamber swings open. A great power beyond all human understanding thrums within, a beckoning force that draws the souls of the dead toward it. There can be no doubt. They are in the presence of the holy clavis.The Order Secutors are close. Lightning and Fang must hurry to claim their prize.
;Entry 3
:The order plans to use the clavis in the Soulsong. The ceremony will not ease the suffering of the dead—it will obliterate them once and for all.Vanille does not know this, but she does know the ceremony will kill her. There is one more chilling fact: if the Soulsong is carried out, Lightning will lose all hope of finding Serah again.
==Walkthrough==
Examining the Sacred Gate with the Saint's Crux in the inventory opens the door. Examining the clock at the far end pits the party against a boss; depending on the day it will be either Grendel or Parandus. After vanquishing the boss, Lightning can pick up the Preta Hood and exit the ruins.
==Rewards==
Completing the quest earns the The Mystery of the holy clavis achievement.
:First Time Rewards: Max HP +540, Max ATB +10, Strength +28, Magic +56, Recovery Item Capacity +1
:Subsequent Rewards: Max HP +192, Strength +5, Magic +5
Category:Quests in Lightning Returns: Final Fantasy XIII