After the defeat of Aqua, with Ventus there to witness it, Ven is filled with Rage. As he Battles his Other half, tears fill his eyes, with thoughts of his lost friend. Vanitas Only fights untill he is weak enough to Merge together with Ven (just like he did in BBS) but instead of being defeated by the *Last Word* Command, Vanitas Strikes the Beam of Darkness* and knocks Ven into Sleep. Vanitas, now having all control of Ven,(and who has now disappeared from the stain glass window awakening) and wields the fully complete X-Blade in his hand, heads up to Master Xehanort at the top of the cliff where they parted to carry out their plans, but Xehanort is nowhere to be found.
Vanitas then starts a journey to search for Xehanort, destroying worlds in the process. Having all the worlds population surrender to the Dark, Unleashing Unverse, and Recreating the Worlds in the Image of darkness.
When he comes across Xehanort, now Terranort, he duals him in Raident Garden. After only a few Seconds from the start of the battle, Vanitas impales his master with the fully completed X-blade. As Terranort falls into the Realm of Darkness, Vanitas Destroys Raident Garden and continues to rule all worlds in darkness. As Ventus is still trapped in Vanitas's heart, he crys in dispair For his friends, Terra and Aqua.
Back at Keyblade Graveyard, on the cliff, next to the only remains of Terra, the Lingering Sentiment, his Orange Wayfinder is cought in the breeze, and lands safely on the bottom where Ventus fought Vanitas. Ven and Terra's Wayfinders find each other while Aqua's Wayfinder flies in the breeze as well, and lands right next to Ven and Terra's Luck Charms. With only a couple of cracks and dents in the charms, they lay together in rest at the tragic conclusion of the Trio, lost in eternal darkness.