Armor cracking unit
From Halopedia, the Halo wiki
Armor cracking units are small Forerunner automatons designed to break through Forerunner armor, including combat skin, usually for the purpose of sabotage. They are about the size of a human fist, and have been said to resemble metallic fleas.
List of appearances
- Halo: Primordium (First appearance)
- Halo: Primordium, page 13