- “Corporal Paraplonk: The vines are sorta creepy... I mean, they're great, but...
Sergeant Guy: Agreed. They are suspicious. A guy has to wonder... What kind of energy is flowing through them? It looks...off.”
- —Corporal Paraplonk and Sergeant Guy, Mario & Luigi: Dream Team
Dream Vines are strange, purple vines that appear in Neo Bowser Castle in Mario & Luigi: Dream Team. These vines are found through the castle, from small tendrils to gigantic, column-sized ones (with smaller ones intertwining with them), and glow as energy flows through them. Some tendril-sized vines come up from the castle's lava and wrap themselves around platforms, or climb up walls, transmitting energy into them. Others appear as tree-like structures with dream energy swirling at the bottom.
When Mario and Luigi enter the main hallway of Neo Bowser Castle, they find Private Goomp, Corporal Paraplonk and Sergeant Guy observing a giant Dream Vine, pondering about the nature of it. As the Mario Bros venture deep into the castle, and make their way to Bowser's bedroom, they find the source of the vines, all converging like a heart at the central platform where Bowser is sleeping. It is revealed that the vines originate with Antasma, with Prince Dreambert theorizing that Antasma is absorbing and converting Bowser's dreams into energy. The energy produced through Bowser's dreams pulse through the vines distributed throughout the castle. The vines function like arteries in a circulatory system, powering the castle (how exactly it powers it is never explained). The energy flow from the vines would cease when Bowser wakes up, but is impossible because of a barrier that protects him. Prince Dreambert binds himself to the vines, merging Luigi's dream with Bowser's. After the Mario Bros. defeat Bowser in his dream, he wakes up, causing the energy from the vines to stop flowing, with the vines turning gray in the process.
- In the cutscene where Antasma convinces Bowser to fall asleep to provide energy for the castle, the vines underneath them are purple, with the barrier shielding Bowser's bed.
- They are also purple before this cutscene, such as when the Elite Trio are pondering them when the Mario Bros. enter the castle.
- After defeating Bowser in his dream and the energy no longer flowing through the vines, the vines that appear in the backgrounds during enemy battles still remain purple.
- Prince Dreambert: These vines originate with Antasma...
- Prince Dreambert: He's likely absorbing the power of Bowser's dream as he sleeps...
- Prince Dreambert: Yes, and the castle pulses with life due to that energy. These vine-like things are distributing it throughout.
Starlow: Yeah, now that you mention it... Those things are everywhere! No wonder... So the vines are powering the castle...
- Prince Dreambert: If Bowser wakes up, the energy flow will soon cease, but...
Starlow: But what? Let's detach Bowser from Antasma right now!
Prince Dreambert: Focus. As you saw when Luigi tried earlier... That barrier will spurn any direct assault.