Nightmare Armor Ventus

Nightmare Armor Ventus is the final boss of Kingdom Hearts 3D: Dream Drop Distance.

Kingdom Hearts 3D: Dream Drop Distance
When Riku travels to Sora's Dive to the Heart, the Nightmare Armor appears out of the darkness and engages him in battle. Upon the Armor's defeat, the darkness covering Sora and his Keyblade cracks and fades away, leaving a comatose Sora behind as he falls into a pool of darkness.

Design
Nightmare Armor Ventus is Ventus's Keyblade Armor, which is now black in coloration. The Nightmare Dream Eater emblem is emblazoned on the visor. The boss wields Sora's Kingdom Key, which is also colored black, with a reverse grip.

Role in Ultima
In Ultima, Nightmare Armor Ventus is revealed to be Vanitas's secondary Dream Eater form, created by Master Xehanort using the darkness he placed within Sora in order to create a full dark warrior for use as a guard so that no one could rescue Sora from his dark sleep. But once the Nightmare Armor was destroyed, it's evil was exorcised out of Sora and ended in the Wasteland, where the Shadow Blot revived it, gave it it's own body to inhabit, and granted it physical form as a new warrior within the ranks of the Circle of the Blot. Unmasked, the Nightmare Armor looks like a black-haired, golden-eyed version of Ventus with a long drip of thinner across his left cheek. Nightmare Armor Ventus now is obedient to the Shadow Blot in its mad desire to conquer the entire universe. It will soon confront its original self, Vanitas, in a future battle between the Blot and the Organization.