The video above is the Halo 5 Guardians Skip Warden Boss Battle Glitch and shows a method to skip the Warden Boss Battle in The Breaking, the mission featured in Halo 5 Guardians.
The glitch allows you to skip the entire Boss Battle in Mission 14: The Breaking, where you have to fight with three Wardens at once.
All you have to do is jump using one of the ramps, dash, and then power charge on top of the platform where the Wardens spawned. You can’t access the platform during the battle, since the Wardens destroyed the bridge.
Normally you have to defeat them and the bridge will reappear. Using this method you don’t have to use the said bridge to reach the platform. The glitch works on any difficulty, even on Legandary, which makes the boss fight very easy.