The group had been traveling for 2 days when they finally got to Iceberg Lake, the lake you need to cross to get to the Lich's lair.
"We're here!" said the pink prince and princess. Everyone else sighed out of being bored from all the traveling. There was literally nothing to do sitting on the back of a dog.
Jake transforms from a flat platform with 6 inch walls into a large dingy, and as usual, they cross. The old subway entrance which is the Lich's layer is finally in sight.
"Alright guys, I have a plan," said PB, "Finn and Fionna, you go beh-"
"Can't we just fight the stupid thing?" interjected Finn. "I mean, we have beat him before, how hard could it be?" There was a short moment of silence.
"Fine, then. Just start punching him and kicking him or whatever." said PB, but this time, she said it a bit sarcastically. The group slowly enters, and to no suprise, they see the Lich and his well, but for some reason, an icy-looking contraption is sucking the strange green fluid from inside the well and pushing it into a portal. Though they didn't expect the first place they were going to be the right one, they were all pretty suprised that they had found the powering source for the inter-dimensional portal.
"Alright," whispered Prince Gumball, "That is the source. We just have to try and stop the strange icy thing in the well from sucking all of the Lich's power into the portal. Is everyone ready?" Everyone nods and quietly says yes.
"OK, on the count of three, we attack. One-"
"THREE!" Fionna shouts as she starts running furiosly at the Lich with her retractable crystal sword out and ready to slash. The Lich turns around after hearing Fionna shout, and he shoots a large plume of green flames at her, which she dodges by rolling.
Man, she is good, thought Finn as he also ran toward the Lich. By that time, pretty much everyone was running towards him, well, except Marceline and Marshall Lee, they were flying to the "icy contraption". When Fionna got right in front of the Lich, she took a big swing at his ribs. The Lich's robe was then cut, but nothing major.
Suddenly, Finn, who was running up to the Lich from behind, jumps on his back and starts punching his skull furiously. The Lich effortlessly flicks Finn right of his shoulder, hitting the ground just inches away from the well. That was close, though both Finn and Fionna.
Meanwhile, Marcy and Marshall were using hammers to try and break the strange icy contraption, Jake and Cake were punching it with large fists, and PB and PG were keeping watch just in case someone like the Ice King were to come along and fight them at the well, or maybe even some sort of guards the Lich hired to fight them.
"You are all such fools!" the Lich exclaims, "Though you defeated me before, I have improvedmy strength and powers!" Finn climbs back on to the Lich(still fighting Fionna).
"I bet you haven't even practi-"
"SILENCE!" says the Lich, interrupting Finn and picking him up and throwing him down hard on the ground. Finn lets out a small groan after that painful blow. He doesn't move afterward.
"FINN!" shouts Jake as he takes one last punch at the power sucker thingy and runs over to him.
"Buddy, are you ok?" No answer. "Please! Just wake up! We need you to fight him! He could beat us and destroy everything!" He still doesn't answer.
Jake carries Finn over to PB and PG and tell them what happened. He then goes to fight the Lich in Finn's place.
"Check his pulse, Gumball," said PB, "I'll check for broken bones." Luckily, Finn's heart is still beating, and his only injury is a broken rib.
"Is his heart beating?" asks PB very nervously.
"Yes, he is just knocked out. Any broken bones?" PG replies.
"Just a rib. When he wakes up, he'll be fine."
"Looks like I have incapacitated your best fighter. It looks like I might win after all!" said the Lich evily.
"Yeah, right. We can still beat you HARD!" exclaims Jake, as he punches the Lich in the head very hard, making the Lich fall down. This angered him quite a lot. He throws a huge plume of his trademark green flames at Jake's face to try to replicate what had happened in their previous battle, but Jake knows to dodge those.
Meanwhile(again), a fighting Fionna is becoming increasingly worried about her new found love. She didn't know if Finn would make it. She just had to wait and see if he would wake up.