Yull

Yull was an Unggoy stationed on the Rapid Conversion and was part of Dadab's group. He was the first true Covenant casualty of the Human-Covenant War (excluding two Jackals killed in a pre-Battle of Harvest confrontation). He killed Osmo by shooting him with a plasma pistol, thus tearing his stomach apart. He was then killed by Tartarus, who pulled off his mask and threw him into a whirlpool and down a series of waterfalls.

Yull was one of the least intelligent Unggoy on the Rapid Conversion, which was crewed by (for the most part) Unggoy of less-than-average intelligence.