Nightmare Thorns are large thorns found in the Dream World. These thorns are a dark grey color, and they have large spikes that look like horns. These thorns signify the Dream Guardian's power. When in the Dream World, the Dream Juju makes Tak destroy these thorns to advance, and so the Guardian would be weakened for their future battle. However, the Dream Guardian, it's revealed , is not evil, and Tak was set up, so the destroying of thorns was, in essence, a mistake. During The Great Juju Challenge, Tak and Lok go to The Gates of Nocturne which is a Dream World Challenge. In there, there are Nightmare Thorns, signifying the Guardian still has power. However, the thorns do not have to be destroyed to advance, however they would have mana inside.