Temple of the Shadow

The Temple of the Shadow was a Rakatan Lab turned into a religious icon, located on the planet Fredonia and used by a handful of individuals to tap into the Dark Side Energy  that came from the planet.

Laboratory
Originally created by the sinister Predor Awha, the Temple was constructed as a research lab for the Rakatan Outergalactic Provisionary, and was the location of many experiments such as the creation of the Terraforming Machine that destroyed the surface of Fredonia, and the construction of Force Hounds out of the slave population.

Due to the nature of the Rakata and their dabbling in the Dark Side, the place developed an energy, and tainted the planet with a feeding energy.

Liberation, and Idolization
In 25,200 BBY, Mordenkainen Vorrukur slew Predor Awha in a final battle over the Magma Pits, where the Lab was located. After it's capture by Mordenkainen's Hunt, it was ransacked of all it's artifacts, but not abandoned.

Theories stem from what exactly the Temple of the Shadow did to the then young Mordenkainen, corrupting his mind or simply unveiling an unseen trait in him, but he resided there for five years, as the Democracy he created crumbled around him.

After Mordenkainen's Death, the eventually extinction of the Fredonian People, and abandonment of the planet, the Temple of the Shadow remained dormant, until it's eventually rediscovery at the hand of Mordenkainen's Descendent, Magnus Vorrukur, and prior to that, Sith Assassin Lucia Krealis.

In the later Magnae Imperium, or Late Empire, the Temple was used as a place of meditation and worship for the Emperor Magnus, and he would convene the Ruling Council there, for rituals and other events.