In 2545, it was assigned to the 51 Pegasi system as the staging ground for Operation: TORPEDO. It launched the 300 Spartan-IIIs of Beta Company in Long Range Stealth Orbital Insertion Pods while still in Slipspace.
- Its name is a reference to an ancient Chinese cultural and political concept known as tianxia (Chinese: 天下) which translates to "all under heaven."
- Halo: Ghosts of Onyx (First appearance)
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