After his victory with Vader and the Emperor, Luke fell to sleep and the force entered his thoughts. He saw a new prophecy one of a new Jedi order and a Sith army match it in battle.
"Only a daughter of the force shall withstand the dark side and destroy it. She shall be stronger than entire armies, yet when she is young she will be as week and fragile as a egg. She will not be trained by Jedi, but by a lone warrior lost in his travels with a black lightsaber. He must protect her from the dark side and the dangers of not knowing her true powers. The two must fight not to stop the rise in the Sith but to destroy the dark side. If the two fail the dark side will rule all that exist, yet if the destroy the dark side the Jedi will bring peace and life to all."
After two days, Luke came to. He walked to the Rebel camp, and told Leia and Han Solo of the new prophecy.