Anima Persis

Anima Persis was a planet which was invaded by the Talichre. The Seventh Doctor claimed they did something unspeakably horrible there. (PROSE: Relative Dementias) At some point in its history, Anima Persis was placed under the protection of the Galactic Heritage. (PROSE: The Tomorrow Windows)

Behind the scenes
Anima Persis first appeared in Death Comes to Time; the Kingmaker sent Ace there as part of her training to become a Time Lord.