It comprised of Sith, members of the Imperial Military and Reclamation Service, and served the Sith Empire during the Cold War and Galactic War under the dominion of the Sphere of Ancient Knowledge and it's Dark Council member.
- "This ends now. I declare a Kaggath, a contenst of mutual annihilation pitting powerbase against powerbase. Whoever sheds the most blood wins. To the victor: eternal glory. To the loser: death and shame."
- ―Darth Thanaton to Lord Kallig, declaring his ill fated final attempt to eradicate Kallig's powerbase.
Lord Kallig's powerbase was founded while Kallig was apprentice to Darth Zash, and the young apprentice usurped control of the Cult of the Screaming Blade from it's leader, the renegade Sith Lord Paladius.
Shortly after the establishment of this powerbase, Lord Kallig's superior Darth Thanaton order it to be purged, due to it's alignment with Darth Zash. Ultimately the powerbase survived the purge and an exasperated Darth Thanaton, by then a Dark Council member, declared a Kaggath against his Sphere's subordinate powerbase, and it's leader Lord Kallig. By this time Kallig had expanded the powerbase significantly, not only gaining powerful allies in the Imperial Military, notably Moff Valion Pyron, but completing the Silencer project, a superweapon brainchild of the long dead Darth Mekhis.
Lord Kallig defeated Thanaton in most major confrontations in the Kaggath, and the two finally dueled publicly on Corellia in front of Sith and Imperials. When it became apparent that Kallig was attained the advantage, Darth Thanaton fled to Korriban to seek the aid of the Dark Council. Kallig followed Thanaton to Korriban and fought their way to the Dark Council chamber where Thanaton was making his pleas to unreceptive Dark Lords. The two once more fought, and Kallig defeated Thanaton decisively. The latter was executed by Darth Mortis, who immediately offered Kallig Thanaton's Dark Council seat.
Kallig was raised to the position of Darth, and given the title Darth Nox. With the accession of Nox to the Dark Council, the powerbase disestablished and fully assimilated into the Sphere of Ancient Knowledge.
- Star Wars: The Old Republic (First appearance)