Regicide

Regicide is a gametype for Halo 4. It is a variation of Free-For-All gametype where it places the leading scorer as the king. The leading scorer raises his bounty as he kills; other players would need to kill the leading scorer to claim the bounty.

Team Regicide is a variant of Regicide in which both teams have their own kings, and players need to do their part in killing the opposing team's king and protecting their own. It resembles the VIP game types in Halo 3.

Trivia
Regicide is also the name of a Foundry map variant in Bungie vs World playlist.