Deliver the chest Sirink gave you to Nestor in the Library of the Sages and ask him about the materials inside the chest.
Step 1. Go to the Library of the Sages and deliver the Padlocked Chest to NestorA scholar at the Library of the Sages in Sanctum. He studies history with an emphasis on the Humans who lived in each epoch..
Step 2. Go to the Protectors Hall and deliver the Padlocked Chest to BoreasPreceptor of Gladiators and Templars. He is in the Protectors Hall of Sanctum..