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Path Kethona (known as the Large Magellenic Cloud by the UEG) is a small galaxy located about 160,000 light years from the Milky Way that was believed by some Forerunners to be the source of the Flood.
After the Ur-Didact was imprisoned in his Cryptum for the first time, the Librarian and four other Forerunners took the vessel Audacity into Path Kethona to look for a solution to the Flood threat. Instead they found a planet containing primitive Forerunners and knowledge of the Forerunner extermination of the Precursors.
- Halo: Silentium (First appearance)