Kylo Ren is really Ben Solo, son of Han Solo and Princess (now General) Leia. Han is killed by Ren in Starkiller Base. Tapping into her dormant Force powers, Rey fights Ren in the snow outside, as the planet is ripped apart after the strike team scores a fatal blow. Separated by a chasm, she and Finn escape on the Millennium Falcon while Kylo Ren, injured, is retrieved and taken to Supreme Leader Snoke to complete his training.
Back with the Resistance, R2-D2 awakes from his low power mode and provides the missing piece of the map leading to the location of Luke Skywalker. Rey takes his lightsaber and flies out on the Falcon with Chewbacca, meeting Luke, who's standing along on a cliff, clearly having sensed her pending arrival...
Jon Sandys ★
Answer: The First Order already has the piece that R2-D2 was carrying as well. That is the first piece, the large piece of the map missing a small section. The second piece is carried by BB-8 and only by BB-8, the missing piece in the map. All the first order needs is that second piece, and so does the Resistance. However the Resistance needs R2-D2 to activate again so he can show them the first piece, so they can put the second piece in it.
lionhead