https://www.polygon.com/e3/2018/6/12/17453142/destiny-2-forsaken-gambit-power-level-iron-banner

Gambit is the name of a brand-new multiplayer mode coming to Destiny 2: Forsaken. While that mode is still in the balancing phase, representatives from Bungie tell Polygon that a player’s power level will be a factor in the player-versus-player phase of each match. Unlike in Destiny 2’s Crucible component, high-level players will have an advantage — but only during certain phases of play.

Gambit pits two groups of four players against one another in a race to defeat computer-controlled enemies faster than their opponents. The first team to kill off the end boss, called a primeval, wins.