The heroes had been fighting(or breaking the power gainer) for about 10 minutes, and the ice power thingy was almost broken.
"Almost...there..." groaned Marceline as she and Marshall Lee took their last swings.
The freezing cold contraption broke, and dropped into the Lich's well. At that moment, the Lich, who currently had Finn(yes, he woke up and was ok enough to fight) in a headlock with Fionna, Jake, and Cake trying to release Finn from it, let out a large scream, dropping Finn and slightly, to their surprise, shrinking.
"Jake, it looks like the Lich shrunk, doesn't it?" Finn asked his fighting partner.
"Yeah, I noticed that too. Weird..." said Jake, all while the Lich still screamed in agony.
A few seconds after, the Lich dropped to the ground and turned completely to dust. The eight all cheered in accomplishment. As everyone was high-fiving and such, the unexpected happened. The pile of dust which was the Lich rose up and took shape again, but this time, he was bigger, he looked stronger, and way more scarier.
"Uh… princess… what do we do now?" Finn asked nervously as the figure rose up higher than before.
"RUN!"
They all ran quickly out of the old subway station and got on top of Jake, you transformed yet again to the flat platform traveling thing. Instead of becoming a dingy, Jake just walked right through Iceberg Lake. At that moment, the Lich bursted out of the subway station, and right afterwards, the station exploded with a bright green light, with ghosts blasting out in all directions, booing very eerily(Can't visualize it? Go watch Mortal Folly).
"Faster!" everyone was constantly shouting to Jake as they looked back at the ever familiar and terrifying scene. When the shockwave hit them, it was so strong, everyone nearly fell off Jake, Jake himself almost falling right into Iceberg Lake. Everyone was now terrified of what might happen next. Though unbeknownst to them, the large amount of the Lich's power that was in the "quantum foam" Prince Gumball explained was around them was slowly tearing the Lands of Ooo and Aaa completely apart.
It was night time then, so the group of 8 decided to take refuge in the same cave where they spent the night while traveling, the spot close to the place where what happened between Finn and Fionna had happened.
"Alright, Gumball, what just happened back there?" asked Fionna, about as confused as the others.
"Well, what it looked like, when the icy contraption sucking the Lich's power from his well fell into his warm well, it killed him, so when he regenerated, he became bigger so no one could stop him…? I don't quite know." he explained.
"So what now?" Marshall Lee asked, surprisingly starting to become a bit bored.
"I think the first thing to do is defeat the Lich so he doesn't come back for GOOD," said Finn, "He is really powerful, and we can't have him mess us up again."
"But he is way harder to beat now," added Cake, "How are we gonna do that?"
Princess Bubblegum stood up. "I know. We'll head back to the Candy Kingdom in the morning, but for now, let's sleep, it's late."
Everyone agreed, and went to their spots they were in last time they were there, as they were the most comfortable. They all fell asleep pretty quickly, tired from the fight with the Lich, except Finn. He couldn't stop thinking about what may happen now that the Lich is more powerful than before.
Will they win the battle and save Ooo and Aaa?
Will the multiverse be destroyed by the Lich and Ice King?
Will they all die?
Would Fionna die?
Would he be the only one to survive?
So many different outcomes, so much stress. He didn't get much sleep that night.
In the morning, they all headed out of the cave, anxious to hear what PB had in store for them. When they finally reached the Candy Kingdom, she told them what they would do.
"You all know how me and Prince Gumball have Gumball Guards and Guardians?" she said. Everyone nodded. "Well, my plan is to get the guards and guardians from the Land of Aaa to the Land of Ooo to fight the Lich with us. We would pretty much have an army!"
"But how will we open up the portal from Ooo to Aaa?" asked Marshall.
"Well, maybe one of us can try to find a portal somewhere. There's bound to be one, right?" exclaimed PB.
"I'll go!" excitedly shouted Finn, "I am craving more action!"
"And I'll go with him." Jake added.
"I'll go with you guys if Cake goes," says Fionna, turning to Cake, "Do you wanna?"
Cake hesitates. "Um.. it sounds a bit dangerous, as the Lich could be there, but I guess we-"
"YAY!" shouts Fionna as she runs over and hugs Finn. He hesitated, but hugged back.