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Located on Koros, the Cestus Complex was the home of the now inactive House Cestus. The Cestus Complex was constructed in a series of natural, underground tunnels, which lead to a rather large cavern. Portions of the base had been mined out, leading off from the main cavern. The main training grounds of Cestus were on the surface, in a bowl-shaped valley, where the warriors of Cestus honed their skills. The young recruits of Cestus were trained underground, where they were prepared to train in the rigors of the moon's surface when they had attained the proper rank. The base was all but completely destroyed during an outbreak of Aptrgangr which occurred following the Fifth Great Jedi War.