: "Salvation" is the final mission of the Legacy of the Void campaign where you must defend the Keystone on Aiur.
If you are referring to the "Salvation" raid in Destiny 2 , here is a quick overview of the Garden of Salvation mechanics: Sky Salvation
: Players must form a chain to link a "Vex Cross" to a "Vex Lock." This is used throughout the raid to open doors or bypass shields. : "Salvation" is the final mission of the
: Defend four towers around the map, periodically using the tether to refresh the "Enlightened" buff needed to damage shielded enemies. Sky Salvation