Last thread, I shared a plotline of how I imagine Quest Sprout's story continuing. You can check it out here:
imgflip.com/i/azen70#com40416850
I ended it at a cliffhanger where the Sprouts returned to the Dream Realm, which got turned into a place of nightmares by Eternal. And in this comment thread, I'm gonna write out what I imagine the last stand against him being like. So without a further ado, let's go!
The Sprouts enter the Dream Realm, thinking that they're safe from Eternal as long as they're near the Dream Village, and play together while stargazing. However, they notice how the realm is starting to become corrupted; the soft, cloudy terrain becomes hard and rocky, the trees begin to die, and the stars go dim and fall from the sky.
Suddenly, manifestations of monsters, including the Endwyrm, the Bu creature, giant Fungeon mushrooms, and a clone of Quest Sprout possessed by the Foolsblade, appear and begin to approach Quest Sprout. Momma Sprout tries to intervene, only to for her spells and attacks to have no effect on the monsters. The monsters then chase Quest Sprout, who runs off in fear. Momma Sprout tries to pursue the monsters to save him, but is suddenly attacked by a giant hand trying to capture her.
Back in the mortal realm, Langeschwert, Mincer, Hack, and Hash, who are walking across the Questwood and talking about how nice it is that Quest Sprout and Momma Sprout are back together, find the Sprouts and notice how they seem to be having nightmares while asleep. They try to wake them up, but to no avail. The Dream Princess then opens a window from the Dream Realm to tell the group that Eternal has corrupted the Dream Realm, and that he's trying to get revenge on the Sprouts. The group then joins her in the Dream Realm to help her find the Sprouts to save them.