The Vegetal Invasion

The Vegetal Invasion is an event that will happen sometime in the future. From what we know based on Sans' gaze, a more evil form of Nightmare will have The Mask of Ultimate Power, the Octahedron of Transcendence & the Icosahedron of Capacity. He will use this power to become the Absolute God of all Reality (or at least he'll think he is), and unleash the Vegetal onto World Prime.

--The Vision--

???: Tremble before the ABSOLUTE GOD OF ALL REALITY!!!! I SHALL UNLEASH VEGETAL ONTO THE 3RD DIMENSION!!!!

Vegetal, appearing out of a portal: We are free of our prismatic shackles!