Lost Scriptures can be obtained from Elite Lootboxes, and can drop rarely from alert bosses. There are currently two available. Both Lost Scriptures are consumed upon use. The Lost Scripture #1 can be activated when a character reaches 100k base fame and when the account has 10 stars. The Lost SCripture #2 can be activated when a character reaches 100k base fame, when the account has 10 stars, and when the character is completely maxed (12/12).

Lost Scripture #1

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This scripture allows the use of nodes on marks on a character. Once this has been used on a character, go to the nexus and click on the bottom right image on the UI located in the top left corner. This will bring up the mark shop UI.
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From this UI, you can purchase marks for Onrane. You can purchase a total of four small marks for 15 Onrane each and a single big mark for 40 Onrane. This will cost a total of 100 Onrane.

Lost Scripture #2

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This scripture allows you to gain an additional 10 points in all stats through the use of stat vials. These can either be obtained as drops from raid bosses or crafted using two greater stat potions in the Sor Forge. Crafting them this way will cost you one Onrane per vial.