::::ATTENTION NEW READERS::::

::YES, the Mushroom War comes soon. It is less than 5 chapters away::

This is Part 2 of a hopefully 8 part series. If you have not read Part 1, please read it or else you may be completely lost and confused.

This is a connection story between Adventure Time and Regular Show. This is not just a random cross-over, this story portrays both shows as if they are in the same universe and will try to offer origin stories to many Adventure Time items and the end of the Regular Show story, such as the Enchiridion, the Mushroom War, Marceline, the Candy Kingdom, and the Lich. YES, I know there is one major, MAJOR flaw that I have in this set of stories, but I have tried to explain its legitimacy to the fullest extent.

This story is too large to make into one story so it will be broken up into multiple stories spending time equally in both Regular Show and Adventure Time universes. Follow me, the author (Old Username: GearSolidSnake), for the future stories after each one.

Enjoy!

Disclaimer: I do not own Regular Show or Adventure Time, all rights are reserved by Cartoon Network. None of these characters or these items are owned by me.

::YES, the Mushroom War comes soon. It is less than 5 chapters away::

Rigby was running as fast as he could. He had just run ten miles nonstop. He felt on the verge of throwing up.

Oh God, what had he done? Don, his own brother… dead.

But there were still worse things to come and Rigby knew it. He continued to run back to the house.

"Just keep the same plan Rigby, nothing's changed. That wasn't your fault"

Rigby sides were cramping from running so much. He took a moment to stop running only to puke.

He finally made it to the Park gates. He took a while to regain his breath. His running was now reduced to a light jog.

Rigby made it to the house. He collapsed on the left outside wall, gasping for breath.

He was going to head for the front door, but something inside caught his attention…

"… Oh my God… Yeah I'll tell him. Th-Thank you for calling. Bye." Benson sighed heavily as he hung the phone back up. He just couldn't believe what he was hearing. The worst part will be breaking the news. Benson usually doesn't cry, nor did he now, but the thought of it was… heartbreaking.

"Hey Mordecai! Can I talk to you for a second?" Benson yelled from the kitchen.

Mordecai's drudging footsteps could be heard as he walked down the steps and into the kitchen. Rigby was still outside, back pressed against the wall and occasionally peering through the living room window. He could hear every bit of their conversation.

"What is it now?" Mordecai asked. His eyes were red head was groggy. The Crown wasn't doing him any good lately.

"Do you know where Rigby is?" Benson asked concerningly.

"Yeah, I think he drove off earlier, why?"

Benson sighed before he said, "Rigby's brother Don… died this morning…"

Mordecai was wide awake now. "WHAT?! What do you mean dead?!" Mordecai got a major headache at this news. His chest felt queezy and he almost felt like crying. He knew Don, quite well actually. But, just dying out of the blue…

"I was wondering if you would be the one to break the news to him," Benson said quietly with sadness in his voice.

Mordecai was still horrified. "How?"

"The mortician didn't give me a lot of details, but he did tell me that-"

Just at that moment, Skips entered through the kitchen door. "Hey Benson, Mordecai… What's going on?"

"Skips, I need to tell you something…"

"Shit!" Rigby thought to himself outside. "I can't just go waltzing in through the front door or they'll see me and know something's up… Gotta find another way inside…"

He was planning to warn his friends, but he couldn't now. They wouldn't believe him, especially Mordecai. Also, he would definitely suspect something.

Rigby wasn't really much of an acrobat, but he had an idea in mind of how to get in. He walked around to the side of the porch, still on the outside. He got a running start, ran to the wall, jumped up and got a foot on the railing, jumped through the air and grabbed the edge of the porch roof.

Rigby was a little shocked he could do that all. But here was the hard part: pulling himself up. "Come on, you mastered magic but can't even do a fucking pull up?!" He struggled as he slowly pulled himself up on to the porch roof, pathetically kicking his feet the entire way up. From there, he climbed into his room through the window.

All the while he made sure that he was quiet as possible.

"Skips, I need to tell you something… Rigby's brother Don died this morning."

Skips was shocked. "What? How is that possible?"

Benson stammered, "I-I don't know. All they told me is that there was some kind of explosion at his house. They didn't really say much else."

Skips' mind was already racing. He had been closely watching Rigby over the past couple of weeks. He sometimes watched some of his practices and knew full well he had the book and what powers it was giving him. But Rigby never actually did anything bad with it. Skips actually believed Rigby had control over it. But there always was that lingering fear…

Skips asked intently, "Where's Rigby?"

Mordecai answered, "He drove off this morning."

"Did he say where he was going?"

Mordecai shook his head, "He didn't really say anything to me, but he was acting a little strange."

Skips was getting closer to his suspicion. "How strange? Anything he said in particular?"

Benson interrupted, "Skips, I don't see what this has to do with anything! The poor kid's brother is dead, and this just seems unnecessary."

"I'm getting to my point." Skips replied. He turned back to Mordecai, "What was strange with him?"

Mordecai tried to remember, "I-I don't know. He was rambling about how the end is near or some kind of crap like that. He looked terrified, and it got me a little scared myself. Why?"

Skips took a deep breath for what he was about to say next. "… I think Rigby killed Don…"

"WHAT?! That's the stupidest thing I've ever heard! Skips, how could you even… !?" Benson was shocked and angered by this. He couldn't even finish his sentence.

Mordecai thought about it a moment. "How…?"

Skips said, "Look, Rigby had the book. Mordecai, you know what I'm talking about: the one from Simon's bookbag."

Mordecai was starting to put the pieces together in his mind. "What does that have to do with anything?"

"Do you remember how the Crown gave you ice powers?"

Mordecai nodded his head.

"The book is doing the same thing to Rigby, but with something a lot darker." Skips explained.

Benson was confused, but at least tried to understand. "How do you know this?"

Skips grew a little hot with guilt. "Because I've seen Rigby with book."

Mordecai almost screamed, "WHAT! And you didn't take the book off of him?!"

"I tried to, but he convinced me that he could handle it!" Skips replied.

"And you believed him?" Mordecai still couldn't believe what he was hearing.

Benson was rubbing his eyes with the fingers on his right hand. He tried calming down. "So let me get this straight… You trusted Rigby, our Rigby, with an unimaginably powerful AND dangerous book for how long now?"

"… Two months…" Skips replied.

"WHAT?! Are you serious? So Rigby has been running around with that thing all this time?!" Benson screamed. His face was growing redder.

"I thought he could handle it! You haven't seen Rigby do anything wrong over the past couple of weeks have you? Neither did I!" Skips said as he justified himself.

Mordecai shook his head as he said, "You never should have left it with him…" Mordecai was in the wrong himself. He kept the Crown and it even made him hurt other people, but it never made him… kill anyone…

Skips replied, "Look, we don't even know if Rigby DID kill Don. For now let's just find him and-"

Their conversation was interrupted by yelling from outside. It was Thomas's voice. After their conversation, all three of them figured who Thomas was yelling at.

Skips and Benson quickly ran outside, but Mordecai went upstairs. Mordecai was furious. He knew Rigby killed Don. "That mother fucking-… He's not getting away with this… " He ran into Benson's office. He knew Benson had recently gotten two of these, but he only needed one.

After searching through Benson's desk, Mordecai had found what he was looking for. The weight felt a little odd in his hands and he never really touched one of these before. But he quickly grabbed it and headed downstairs.

Once Rigby was inside his room, he ran into the bathroom. He turned on the sink and took a long drink of water. Running 10 miles makes you thirsty beyond belief. He washed his face and looked up at the mirror. His face looked like crap. He had been through a lot that morning.

He quickly remembered why he was back at the house. He opened up the mirror: Medical Supplies. It was small, but they had a first aid kit on one of the shelves. Rigby took it and put it into his bag.

Toothbrush and toothpaste: not exactly a survival necessity, but Rigby thought it would be nice to have. Into the bag he put them. As he stepped out of the bathroom, Rigby could hear what was going on downstairs. He heard Skips say, "I think Rigby killed Don…"

"Oh shit! Hurry!" Rigby did not want to stay in the house any longer. He frantically opened and searched the drawers in the room. All he could find was Mordecai's pocket knife. He checked the closet. He didn't have any room for any of the stuff they had. The only thing he could carry was the time machine, but that broke months ago.

He ran out of the room, heart racing and head pounding. He could hear from downstairs: "The book is doing the same thing to Rigby, but with something…"

Rigby ran through the list in his mind: "All of our camping stuff is in the basement and Mordecai and them are blocking it off. Food: can't go in the kitchen. I'll find food on the way. Looks like I'll have to make due…"

How was he going to get out though? He could climb up the roof; back down… not so much. The only way he could get out was through the front door. He'd have to be quiet if he didn't want them to notice him.

He slowly crept down the steps. He glanced over to the kitchen. Luckily, the three were not facing the living room. Rigby slowly walked over to the door. He took quick glances at the kitchen every second.

He slowly and careful turned the door handle. He pulled back the door. It felt like an eternity with the time he was taking. The loudest thing Rigby could hear was his own heart beat.

He had the door open enough to slide through. He was outside on the porch now. He preemptively turned the doorknob before he closed the door so it would not make a Click . He pulled the door closed and let go of the handle.

He took a sigh of relief. He walked down from the porch steps. Where to now? The only thing left he could do was warn Eileen. Would she believe him? Maybe…

How was he going to get there? Cart? Maybe, but Mordecai and Skips would probably hear it starting. And if Skip's suspicions got public, then a cart from the park would be a dead giveaway.

It was worth the risk, at least for now. Maybe he'd switch off with Eileen's car… if she listens that is.

"She's not going to believe you. She'll betray like the others are doing now. It's just you and me…"

Rigby quickly hit his bookbag in the spot where the Enchiridion was. The voices weren't stopping. The Enchiridion was more of a burden than anything else now. Eileen was the only thing that could stop the book. He knew it would be best that he got rid of it before whatever would take place. Rigby never tried magic without the book and he didn't know if he'd be able to do it with the book gone. But he didn't care about that. He had a gun anyway and maybe things would start to turn around after it was gone.

All this he thought in his head as he headed towards one of the carts near the house. He was about 40 feet from it when his path was blocked off.

Thomas walked in between Rigby and the cart, whistling with his hands in his pockets. He turned and saw Rigby. He waved with one of his hands, "Hey Rigby, what's up? Jeez man, you look like crap."

No no no, why's he getting the way? Rigby calmed a little and just decided to keep walking. "I can't talk right now Thomas."

"Dude, what's wrong?"

Rigby replied, "Get out of here Thomas," Thomas was deeply surprised by this. Rigby was still getting closer to Thomas and the cart, "Get out of here, right now."

Thomas didn't move. Something in his gut told him not to move.

"If you know what's best for you, you'll get the hell out of here!" Rigby said. It didn't work, Thomas was still blocking his path to the cart.

"What the hell is going on with you?!" Thomas almost screamed. He never thought of Rigby as 'tough,' but what was being said was starting to scare him a little.

Rigby was getting angrier. There was no way of getting to the cart without hurting Thomas. He had to stop himself. He wasn't going to let Thomas end up like Don. Rigby frustratingly shook his head and turned away. He had to get out anyway. Rigby's hunches were flaring up again, " Skips and Benson are coming."

Rigby quickly walked off. He was going to have to travel out on foot. Eileen's apartment was on the other side of town, too far to walk. He'd have to settle for someplace closer.

Rigby could hear Skips and Benson opening the house door behind him. He just kept walking.

"Rigby!" Benson screamed to him. Rigby didn't stop. "RIGBY!" He yelled again, this time louder. Again Rigby didn't stop moving.

"We know about Don." Skips said. At this Rigby stopped moving. "You've gone too far this time, Rigby! Give me the book."

Rigby turned around. His eyes were ridden with guilt. His hands were shaking from nervousness.

"Just give me the book Rigby! We'll deal with this as delicately as we can, just give us the book!" Skips pleaded.

Rigby looked down for a moment, thinking everything over. He turned back to Skips, "I really wish I could Skips… but I can't. Not anymore"

"This is for your own good Rigby," Benson spoke this time, "We can't let you hurt anyone else, not like Don-"

"THAT WASN'T MY FAULT!" Rigby screamed in anger. He threw his arms at his sides. Bright green flames emitted from his palms. Everyone except for Skips took a step back.

Skips asked, "I'm only going to ask this once: Give me the book!"

Rigby looked on with a stern face. He simply shook his head 'no.'

Skips began to skip towards Rigby in his usual fashion. But he much more serious than Rigby had ever seen him.

Rigby panicked. "Stay Back! Just let me go" Rigby yelled. His flames in his hands grew brighter. Skips still grew closer.

In a panic, Rigby screamed as he hurled one of his fireballs in Skip's direction. It exploded a few feet in front of Skips. The explosion pushed him back a few feet. Skips was still on his feet. Again he kept getting closer to Rigby, a little faster now.

Rigby hurled the fire ball in his right hand at a curve. It came at Skip's side and exploded right next to him. It lifted Skips off his feet and threw him to the ground.

Skips was in pain. The left side of his body was a little burnt.

"SKIPS!" Benson screamed. Thomas and Benson both ran to Skip's direction.

Just then, Rigby threw flames from his hand so that it made a wall between Skips and the others. Rigby now started to walk towards Skips, flames at his sides. Anger was written all over Rigby's face. The Enchiridion urged Rigby on, like it did with Don. Except this time, it let Rigby do it himself.

Rigby was now only a few feet from Skips. He raised his right arm, fireball in hand. Rigby closed his eyes, preparing himself to kill Skips…

Rigby's hunches flared up, they told him: Left Side, Shield Wall. Rigby quickly turned and put up a shield wall. A bullet quickly ricocheted off of it.

The gunshot was loud and it startled everyone.

It was Mordecai, holding Benson's Glock pistol, smoke coming from the barrel. Mordecai's eyes were intent on Rigby.

Rigby looked down at what was left of the fire. Then he looked at saw Skips slowly trying to get up. Guilt ran through Rigby. "Just like Don…" the book said.

Rigby quickly turned and ran off, leaving the park and everyone in it behind him. For good.

Mordecai ran back inside, still holding the gun. He ran to his closet and grabbed the Crown off the shelf. He was going to need it. Before he left, he went back into his room. In his dresser was a metal canteen full of Gin. He took the lid off and took a quick, yet large gulp of the alcohol. It felt good going down. He felt like he needed that shot for what he was going to do next.

Mordecai walked back outside, gun in one hand and his crown in the other. Benson was helping Skips up. He turned to Mordecai and was shocked. "What the hell do you think you're doing?"

Mordecai began walking to the cart. He coldly said, "I'm going to kill Rigby."

This alarmed both Benson and Skips. Skips looked down to see the Crown in Mordecai's hands: "You kept the Crown?! Mordecai, do you know what on earth you are doing?!"

Mordecai didn't respond as he got into the cart.

"Mordecai, if you leave here, you're not allowed back!" Benson said. It didn't work. Mordecai put his key in the ignition and started the cart. Benson said again, "Have you learned nothing from what just happened? Mordecai I can't let you do this!"

Mordecai turned to his boss, "Then fire me! Do what ever the hell you want, but I am not letting Rigby hurt anyone else!" Mordecai drove off.

Rigby was at one of the phone booths on the sidewalk. He didn't have a phone. His call would have to be quick. He felt to exposed on the sidewalk, especially if someone from the park happened to drive by.

Rigby quickly inserted the quarters and dialed the number. He knew it off by heart. The phone was ringing now. " Come on, Come on pick up already!"

Behind the phone booth was the old TV shop. They always had TVs in the window, usually showing the news or something of that sort. The broadcast they were playing in particular caught Rigby's attention.

It was a young news woman. The picture next to her was all too familiar. "Tragedy this morning as a house explosion took the life of…"

"Hello?" Came from the phone.

Rigby spoke into the phone, "Eileen, it's me Rigby. Listen, I don't have much time to explain," Rigby's eyes were darting up and down the street, "but I need you to meet me at the Cafe. Now."

"Alright, but what's wro-?"

Rigby hung up. He quickly ran into one of the alleys. He'd have to take every back way he could to get there.

It was just in the nick of time as Mordecai drove down that exact same street. He saw Rigby's shadow as it went through the alley. Mordecai couldn't drive down the alley. He got out and ran down the alley on foot. When he got to the corner: nothing. No Rigby.

" If I were Rigby, where would I go?" Mordecai thought to himself. "Well he doesn't have anyone left to turn to except for… Eileen… The coffee shop!"

Mordecai headed back into the cart and drove off.