Psychadelic Mushroom

A very large mushroom of exceptionally bright colors that glows in the dark. Its colors are so bright that it even glows during the daytime, but doesn't cause any eye pain. It does cause something else if even a small amount of it is comeume hahahaha i wuv yoooo.
Jack Black got lost on his way to find The Pick of Destiny. That's when he saw some mushrooms. Deciding he was hungry, he ate them and discovered they were magical. In his drugged-out state, he imagined these mushrooms and other things. Some of the things he imagined were an incorrect but vaguely similar version of the Contestants that blended in to the scenery.
Nexus doesn't consider different levels of reality to be all that different, and so he gave the memories that the Contestants would have gained if they were there to them, and rewards to match. This mushroom is growing on the unnamed robot's Sphere, on a Magic Mushroom Block.