Onakk, the Raven, is a member of the Sentinels of Nature and an aged, white Rajamala. Though a long, jagged scar runs across his face and through the empty socket of one of his eyes, his remaining blue eye speaks of wisdom and benevolence. Onakk relies heavily on his spear of bleached wood, with its bronze head and string of seashells looped around its haft, leaning on it for support. He is dressed in faded leather decorated with black feathers (a reflection of his namesake), and his long, white beard obscures most of his wiry form. Because of his age, Onakk remembers the early days of Sentinel history, including the expansion of Hashan and the Dun Valley Saga.

A member of the Sentinels of Nature since its days as a Guild, Onakk partook in the follow-up expedition of Ulangi led by Oswald Snowmantle shortly after his discovery of the island. It was here that he, along with Mehrien and Antion, was kidnapped by a triton raiding party. For countless years, the three were held captive and forced to work within the silver mines of Scyros, until Lupar of 467 AF, when for unknown reasons, they were released and left stranded upon the island of Tuar. During this time, Vixen, the House tutor, began experiencing vivid dreams of them and the island; following clues revealed in her visions, the Sentinels of Nature, in a joint effort with members of the Divine Order of Neraeos, succeeded in finding the island of Tuar and rescuing the three sentinels, bringing them back to the House estate in Eleusis.