In the novel The Courtship of Princess Leia, set four years after the Battle of Endor, Luke travels to the planet Dathomir. There, he discovers a group of Force-sensitive witches called the Witches of Dathomir, banded into two separate groups: a collective of benign, matriarchal clans; the one he is in contact with being the Singing Mountain Clan, and the witches who have turned to the dark side, called the Nightsisters. Discovering a prophecy in which it was told a Jedi would change the way of life on the land, Luke eventually realizes truly what the Force is for the first time in his life. While there, he destroys most of the Nightsisters (including their powerful leader, Gethzirion, and the galaxy's most powerful remaining warlord, Warlord Zsinj). Thanks to the help of the prophecy and witches, Luke recovers old Jedi records left by Yoda about 400 years prior. He decides to start a new Jedi Academy, something he has been trying to do for six months before the start of the novel by finding old Jedi records and archives.