Advanced Defensive Unit

The Advanced Defensive Unit (ADU) is the structure Guardians defend in Onslaught: Salvation, the Episode: Revenant variant of Onslaught. It is the same Advanced Defense Unit structure, and the activity runs in sets of ten waves. If the ADU is destroyed, the run ends.

Enemies

Waves of enemies from the Revenant Scorn, the Shadow Legion and the Dread attack the ADU, and players must defend and repair it.

Scrap and defenses

Players earn Scrap by scoring and can spend it at the start of each set and after the 3rd and 6th waves of a set. Scrap buys and upgrades defenses, including mountable turrets and air-strike terminals, which are added to the original Onslaught defenses.

Revenant content

Wave 6 opens a Revenant Nest to free Eliksni hostages, and wave 10 is a boss wave. The playlist version has one set, while Normal and Legend have five sets of escalating difficulty. Eventide Ruins on Europa is one of the three locations, and its Expert recommended power level is 2065.