Hail to the King
From Halopedia, the Halo wiki
Hail to the King is a Halo 3, Halo: Reach and Halo 4 multiplayer medal awarded during a King of the Hill match for killing 5 opponents in a row from inside the hill before it moves to another location in the map.
In Halo 3 and Reach it is represented by a steel four-pointed star with a blue crown in the middle. In Halo 4 it is represented by a crown will five stars on the points of a crown atop a hill on a grey triangle.
Hail to the King is considered to be one of the hardest non-Legendary medals to earn because players who control the hill are targeted by all other enemy players. Skill and teamwork are key to earning this medal.