The Sixth Battle of Ruusan was the penultimate battle of the New Sith Wars.
The Brotherhood of Darkness sent their minions on a diversionary attack on the Jedi forces of General Kiel Charny while the Dark Lords themselves assembled in a meditation circle far away from the battlefield.
There, under the guidance of the recently returned Darth Bane, the Sith joined together to create a wave of Force-powered devastation that decimated the ranks of the Army of Light and scoured the surface of Ruusan.
In the meantime, 300 Jedi Knights under Lord Valenthyne Farfalla had arrived from their confrontation with King Lahzar, fighting through the Sith blockade over Ruusan, arriving just in time to help stave off Kaan's advances. In the ensuing confusion after the battle, the young Padawan Darovit defected to the Sith, but not before killing the heavily wounded and incapacitated Kiel Charny.