Destiny 2's Season of Plunder brought back an iconic piece of Destiny in the form of the King's Fall Raid, which was one of the biggest endgame activities to tackle in the game, something that carried over to the modern days of the franchise as well. Following in the footsteps of Vault of Glass, King's Fall too was guaranteed to have a Master version in Destiny 2 that would launch a few weeks after the base Raid did, and that's precisely what happened. Bungie's vision of harder content for Raids entails releasing their Master difficulty soon after launch, and the same held true for Vow of the Disciple and will likely be repeated for Lightfall's Raid too.