In the "Mouth of the Sanctum" at the south wall ( The Sanctum ) at ( 12, 157, -40 ) /waypoint 12, 157, -40 you will find The Yore Flame. Examine the flame and you find there is small slot to place the disk. The Shade of Bylze appears and asks you to find 20 hidden scrolls in the Mouth of the Sanctum. NOTE: He will not talk to you unless you have completed Words of Pure Magic, a language quest that will allow you to speak the Druzaic language.
The scrolls are hidden inside of small idols up on the top of little ledges around the ceiling. Target them and hit them with an arrow or any damage spell and they will drop the scroll to the ground. The scrolls will drop directly under the spire that the idols were on top of. Just tab target the idols, and then look underneath once you have destroyed them. Every class has some sort of ranged spell/ability, so use it to destroy the idols and pick up the scrolls. There is only one place where the scrolls are somewhat hard to find, and that's the scroll just to the left of the right entrance into the sanctum. That scroll lands in the water basin instead of on the ground. Note: Each person on the quest must collect their own set of scrolls. Respawn time on the idols is about 6 minutes.
The Shade of Bylze then asks you to prove you are not aligned with the Scaleborn and get a number of armor pieces from the silent sentinels. There are 7 pieces of armor: helm, breastplate, boots, bracers, gauntlets greaves and pauldrons. The update is rather common, but not guaranteed.