Well of the Dark Side

The Well of the Dark Side was a location in the realm of Mortis in which all of the universal energies of the dark side of the Force flowed. The energies were channeled into the bottom of a volcanic crater, and was where the Force wielder known as the Son drew his power. On instructions from the spirit of Qui-Gon Jinn, Anakin Skywalker entered the Well and encountered the Son, who showed Skywalker a vision of the Jedi Knight's future as Darth Vader.