From TheWarWiki

Tome of Knowledge unlock for High Elf.

Enter a High Elf Scenario.

This unlock is achieved by entering the Blood of the Black Cairn scenario. Blood of the Black Cairn is associated with Eataine, and can only be entered when that zone is contested, which requires Destruction to control and lock Dragonwake.

Rewards

• Title: Scourge of the Asur
• 336Xp