This lore can be found on Dromund Kaas.
This strange, suspended monument was commissioned by the late Dark Council member Darth Gorgos in celebration of the Empire’s victorious return to the galaxy and the Sacking of Coruscant. It is the work of the Empire’s finest engineers and took three hundred slaves to build. The cascading prisms symbolize both the ascendancy of the Sith and the downfall of their enemies. The split centerpiece that supports the edifice represents the Emperor. Darth Gorgos was murdered by her apprentice before the statue was finished, but her successor oversaw its completion.