In Destiny 2 Season of the Seraph week 3, the hero get the Operation Seraph Shield quest. This is one of the best quests since the release of the Glykon some time back now. It is hoped that the Operation Seraph Shield will continue into Lightfall. In the meantime, the hero reflects on how to get the exotic Revision Zero. This is the way to infiltrate the facility, get into the escape pod, and then get to the Decontamination Chamber.
There are lots of steps in between the above, and the defeat of Praksis the Defiled, but once Praksis the Defiled is defeated, the hero will get exotic Revision Zero on return to Clovis Bray exo frame.