From Halopedia, the Halo wiki
Retrieved from "https://www.halopedia.org/index.php?title=Untouchable&oldid=1356128"
Untouchable (known as Overkill in Halo 2) is a multiplayer and Spartan Ops medal awarded for killing 25 opponents in a row without dying. In campaign and Firefight it is awarded for killing 50 enemies in a row without dying. In Halo: Spartan Assault and Halo: Spartan Strike the medal is awarded for killing 20 enemies in a row without being hit, and is the highest kill spree medal.
In Halo 4 it is represented by a gold and white eight-pointed star with a gold target in the center. In Halo 5: Guardians it is a gold and yellow eight-pointed star with a white target in the middle. In prior games the star is white and 16-pointed. In Spartan Assault and Spartan Strike it is represented by a stylized shield.