Son's cathedral/Legends

This high tower, belonging to the Son, one of the three force wielders on Mortis, was located in the region where the Force of the Dark Side was strong.

Structure
This tall tower was supporting a huge green sphere. At the base of the tower, there were similar but smaller towers with identical green spheres on top of each of them. Inside the tower, there was large circular window that overlooked a large part of the base. Right in front of the window was the Son's throne. The inside had a high ceiling, more than twice as the high as the total height of the Son in his gargoyle form.

History
In 21 BBY, when the Son had kidnapped Jedi Ahsoka Tano and locked her up there. He then poisoned her, causing her to become a Dark-sider and he watched as she attacked Anakin Skywalker and Obi-Wan Kenobi when they had come to rescue her. At the same time, he was confronted by Daughter and later Father and the tower became a battleground for both the Jedi and the powerful Force-users. The result ended with Daughter dying after sacrificing herself to save Father, Son escaping and Ahsoka recovering back into normal.