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- “I've discovered [that] the Ark keeps an almost finished ring in its central forges at all times. It's an emergency replacement in case one of the other rings breaks down.”
Installation 04C, sometimes referred to as Anders' Halo, was a Halo ring, created by Installation 00 after the destruction of Installation 04B. The ring was intended as a potential replacement should any of the remaining Halo rings be damaged or destroyed. It was discovered by Professor Ellen Anders as she searched for a way to contact the UNSC during the Second Battle of Installation 00.
- Halo Wars 2 (First appearance)