


If the robot seems like he's not moving, move closer to him to try to catalyze its movement, but then retreat far behind it again to dodge being damaged. Whenever you encounter a barrier, blue in color (like the ones in Raven Rock), the robot will take care of it so it and the Pride can proceed. This guy really knows how to take it to the enemy. Regardless, stay far behind him as he shoots his powerful lasers and hurls mini-nukes left and right as if they were mere rocks. Remember - he was programmed before the nuclear war between China and the US, so he thinks the enemy is an external one still. The robot will do all of the dirty work here if you let it just sit far back and watch him completely destroy the Enclave's resistance, though he'll mistake them time and time again, humorously, as Chinese communists. Run outside of the Citadel completely and connect with the Pride and the robot. But first, simply enjoy the sights, as a robot created by the United States government over two-hundred years ago is activated and deployed. Instead, we have to follow the large robot the Brotherhood has been housing and trying to repair for some time as it walks slowly, but surely, towards the Jefferson Memorial from our current location at The Citadel. The game's final mission takes place where Project Purity is housed, at the Jefferson Memorial near Rivet City. Until you're satisfied you've done everything there is to do, be absolutely positive you don't accept her request.

But the real point-of-no-return is when Sarah asks you if you're ready to leave The Citadel to head to the Jefferson Memorial.

This is the endgame - once you enter the Jefferson Memorial, you won't be able to leave. Once you accept Sarah Lyons' mission to head to the Jefferson Memorial with her "Pride", you won't be able to realistically stop the rush, and thus won't be able to do anything else you needed to do in the game. This is oft-mentioned below, but it bears repeating up here so that everyone can see it clearly. (5) Activate Project Purity! (6) Infect the Project Purity water supply. (4) Secure the Project Purity Control Room. (3) Reach the Project Purity Control Room. (2) Follow Liberty Prime as he makes his way to the Purifier. (1) Prepare for battle, and then report to Sarah Lyons.
