When Shilen toppled Ye Sagira, she roused the leader of the ancient Giants, Hermuncus, who is sealed in the ruins. Hermuncus asks adventurers to find and release him from his seals. In return, he promises to Awaken them by giving them the powers of the Giant heroes.
When a character reaches level 85, Hermuncus sends a message directly to the mind of the character, offering the power to confront the Destruction in return for releasing him from his seals. The character accepts and completes the Seize Your Destiny quest, acquires a Scroll of Afterlife, and goes to the Reliquary of the Giants. There, the character brings the scroll item to the statue of the Giant hero that represents the Awakening class the character will become, and the character Awakens.