Khar Hakai was a figure in the mythology of the natives of the planet Obsidian, also known as the Eater of Souls. In ancient days, sacrifices were made to Khar Hakai at a site called Te-wisat-karak, or the Golden Hell. Khar Hakai held a similar place in Obsidian myth as "The Eater of Souls" did in ancient Vulcan culture. (TOS novel: Vulcan's Forge)