Charum Hakkor
From Halopedia, the Halo wiki
Charum Hakkor is a planet in an unknown system that once served as the heart of the Human-San'Shyuum Empire. It shares its system with Faun Hakkor, Ben Nauk and twelve other planets. It once featured a wealth of Precursor architecture and structures. It was home to the infamous Prisoner of Charum Hakkor, a creature of great power that had been imprisoned on the planet. Unbeknownst to most in the galaxy, the creature was in fact the last surviving Precursor.
Charum Hakkor was the site of the concluding battle of the Human-Forerunner War, and also the location where the Didact and Librarian first met.
