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Hidden Potential of the High Priest
Locate and unlock a hidden appearance for your artifact as a Priest.
Hidden Potential of the High Priest requires a Priest to unlock a hidden artifact appearance by collecting 12 copies of 
The Annals of Light and Shadow to obtain 
Writings of the End, rewarding a Replica Altar of Light and Shadow decor item upon completion.
Unlock Class Hall and Artifact
Before collecting any books, ensure your Priest class hall (Netherlight Temple) is unlocked and you have the base artifact weapon for your chosen spec equipped.
Collect Book 1 from Archivist Inkforge
In Netherlight Temple, speak with Archivist Inkforge and select the first option, then the middle option to receive the first copy of The Annals of Light and Shadow.
Collect Book 2 Near Meridelle Lightspark
In Netherlight Temple, find the bookshelf on the left side of the table next to Meridelle Lightspark to pick up Book 2.
Collect Book 3 Behind Juvess the Duskwhisperer
In Netherlight Temple, go behind Juvess the Duskwhisperer and look on the table to the left side to pick up Book 3.
Collect Book 4 in The Violet Citadel
Travel to The Violet Citadel and find the bookshelf to the right behind Archivist Elysiana to pick up Book 4.
Collect Book 5 in Black Rook Hold
Enter Black Rook Hold on any difficulty, defeat the first boss, and then locate Book 5 in the area that opens up after the encounter.
Collect Remaining Books
Continue collecting the remaining copies of The Annals of Light and Shadow until you have all 12, then return to Netherlight Temple to unlock Writings of the End and complete the achievement.