Satele Shan's mindscape
A mindscape was a Force power where a mental environment was created inside a person's consciousness. This ability was wielded by strong Force-sensitives to corrupt and torment the minds of others. An example includes when the soul of Tenebrae took hold of the Outlander following Valkorion's assassination.
Prior to 3627 BBY, Tenebrae once again infected individuals, trapping Jedi Master Satele Shan within the confines of her own mind while feeding upon her essence. In 3626 BBY, a task force under the command of the Eternal Alliance's Commander—formerly known as the Outlander—managed to infiltrate Shan's mind, liberate her, and permanently eliminate Tenebrae.