Invincible - Halopedia, the Halo wiki

Invincible, or Boogeyman in Halo Infinite, is awarded in Halo 3, Halo: Reach, Halo 4, Halo: The Master Chief Collection, Halo 5: Guardians, and Halo Infinite for killing 30 opponents in a row without dying in multiplayer and Spartan Ops. In the Halo 3: ODST, Halo: Reach and The Master Chief Collection

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About the Didact being composed and him still alive. : r/halo

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Halopedia, the Halo wiki

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Halo Invincible by RedWolfmoon on DeviantArt