A letter of recommendation is required to enter the Hidden Library. Speak to Brigade General Spatalos in Verteron to obtain the letter of recommendation.
Step 1. Obtain the letter of recommendation from SpatalosThe Fortress Commander of Verteron Citadel. He lost his wife and son in the Krall War, and has become correspondingly ruthless in his pursuit of victory..
Step 2. Speak with LatriShe guards the secret section of the Library of the Sages in Sanctum..