Disclaimer: I do not own any of the material appearing in this story.

BGM: Overworld (Super Mario World)

"What in the world…?" Yang wondered as they came across a sign as they were heading forward.

The sign said "Yoshi's Island Tourist Trap: The Sunken Ship! Totally not occupied with Ghosts or anything!"

"I don't trust that sign." Grif said.

"Ditto." Jaune and Luigi nodded in agreement.

"Oh come on, it can't be that bad." Ruby said. "Besides, we have Booniper looking out for us." She said as Booniper let out a shy cackle.

"Riiiight…" Jaune muttered. "Still, how are we going to go in there? Last I checked, sunken ships are in the bottom of the oceans."

"I say we turn around." Neptune said. "We can find Bowser's Castle a different way."

"Heck no! I say we go straight in!" Sun said.

"Or we can go into this warp pipe." Mario said, motioning over to it.

"That too." Sun said as Mario hit a nearby ? block and out came several Penguin suits that everyone absorbed… and Sun threw one at Neptune, much to his dismay.

"Remind me why we get scuba year while Mario and Luigi dress up like it's Halloween?" Tucker asked.

"Don't ask me, I'm not in charge of this world!" Grif said.

"Perhaps it only works on certain folk. That's my guess." Sarge said as they hopped right into the warp pipe.

End BGM

World 7-1: Certainly Not Haunted!

BGM: Slimy Spring Galaxy (Super Mario Galaxy 2)

"Here it is, the sunken ship." Mario said, as they all looked at it.

"Yoshi…" Yoshi whispered.

"Mmph... I say we turn back." Luigi said.

"Yeah, I'm with Luigi. There's no way I'm going in there!" Grif protested, only to be met with Sarge's shotgun aimed at his chest.

"Do it, or I'll freeze your insides." He threatened.

Grif grumbled to himself. "Yes, sir…"

"That's more like it!" Sarge chuckled as they swam into the ship, seeing a lot of Fishbones swimming around, and complete with a lot of Boos, but they really didn't pay much attention to the group.

"This is really spooky…" Jaune said.

"It could be worse." Nora said as they swam around and then Pyrrha spotted something as she swam over to investigate. It looked to be a picture of Bowser, only it looked older than any of them.

"King Bowser the first…?" She wondered, as this stopped Mario, Luigi and RWBY in their tracks and then swam over to Pyrrha as the others curiously gathered over.

"King Bowser the first… I think I heard of him at one point." Luigi said.

"Hmm…" Mario folded his arms.

"We actually did hear about him when we were coming to rescue you guys." Blake said. "We discovered an underwater castle at Cheep Cheep Lagoon and discovered all kinds of interesting things, including how he despised the Emperor of the Mushroom Kingdom and it led to a great war before his castle sunk into the bottom of the ocean with Bowser in it."

"There was this living skeleton we met that looked like Bowser, said he was King Bowser the first." Yang said.

"What Blake said is actually right." Nyx nodded. "You see, King Bowser the first was a terribly vicious Koopa King. He hated how the Mushroom Kingdom was prosperous and his kingdom wasn't. They were had terrible conflicts and the Emperor of the Mushroom Kingdom also despised the Koopa Kingdom… until one fateful day, the tension was so high that one of the Koopa Troop accidentally opened fire on an innocent child."

"Oh my gosh!" Ruby gasped.

"Was it a blue child, cause I wouldn't have any problem if the kid was blue." Sarge said.

"I don't think that matters." Nyx answered.

"Was it blue or not?!"

"It doesn't say!"

"Dagnabbit!"

"Wait, how do you know this?" Tucker asked.

"What? I love reading books. Especially Ancient History!" Nyx giggled.

"You have a copy I could borrow?" Simmons asked.

"Nerd!" Grif exclaimed.

"Anyway, where was I? Oh yeah." She cleared her throat. "Yes… and that didn't help any matters, since the emperor heard this and grew absolutely furious that he went to war with the Koopa King… none of the Kingdoms were unscathed. It was so bad, that the Mushroom Kingdom's ally, Sarasaland, had to step in and help fight."

Nyx looked around the ship. "Now that I think about it, this ship looks like the Koopa King's ultimate War Ship that destroyed millions in its way. The dreaded Fire Thwomp." She said. "Despite its name, it fired Banzai Torpedo Teds and Banzai Bills galore, and regular Bullet Bills and Torpedo Teds just in case if its enemies survived. It was basically unstoppable."

"So how did it meet its end? Did it claim it was unsinkable and smashed right into an iceberg, like all ships do?" Sun asked.

Nyx chuckled. "From what I've heard, the Mushroom Kingdom recruited a spy to infiltrate this ship and planted a Bulky Bob-omb near the engine and lit it up, but as he ran off, he was captured by the captain and they tortured him… but before they could kill him, the spy's last words were "See you in the afterlife, suckers." And then the Bulky Bob-Omb blew itself up, killing everyone on board, including himself."

"So, did that turn the tide of battle?" Pyrrha asked.

"We were both evenly matched at the war, but when the ship was destroyed, Bowser was absolutely furious and then even more when the rest of the brigade was destroyed, which had us one step closer to winning the fight. In fact, it helped us to figure out a way to defeat the great Koopa King once and for all, which then led to the underwater bomb since Bowser currently stationed himself at Cheep Cheep Lagoon, and the rest was history."

"Wow!" Caboose said, sitting on the floor. "That was a neat play!"

"That was a story, Caboose!" Church exclaimed.

"To think we're actually in this ship. Man, to think this was the most badass ship in the past. Oh, if only we could see this if it was still in one piece!" Yang said.

"…Then the Mushroom Kingdom would still be at war." Weiss reminded.

"Don't ruin it for me."

"I'm just glad we weren't even alive yet when it happened." Luigi sighed with relief. They swam off while looking around the entire ship until they saw a Warp Pipe as they hopped on in, only… they were suddenly standing in mid-air when they got out.

"Uh… does it feel like we're flying?" Yang asked.

"Yeah…" Luigi nodded as they looked around… and then looked down. "Ooooh…"

"Oh, this is gonna suck…" Church groaned, as they started falling as they screamed until eventually, they hit the bottom while also hitting a switch, as the place started to rumble as another warp pipe came up underneath them and sucked them all in.

End BGM

BGM: Valley of Bowser (Super Mario World)

They all screamed and then was launched out of the Warp Pipe, somehow all of them out of their Penguin Suits as they looked around, seeing where they were. "Oh! We're here!" Ruby said.

"Good! Now let's take down Bowser and rescue the princess!" Yang said, cracking her knuckles.

"There's a problem." Luigi said as he pointed off to the distance, where they saw tons of Deathstalkers and King Taijitus roaming around, complete with lightning flashing and thunder clapping. "We have to get around them."

"Oh boy…" Ruby said.

"Well, let's start going then! The Princess isn't gonna save herself!" Sarge chuckled as they walked through and into a cave, no less.

End BGM

World 7-2: Charging Chucks Galore!

BGM: Underground Theme (Super Mario 3D World)

"It had to be a cave." Grif complained, as a Swoop flew by him, causing him to flinch.

"Oh, relax… it's only a few bats." Simmons said.

"You're not the one who's terrified of bats!" Grif growled. As they wandered forward, they saw a few Charging Chucks coming straight for them, causing them to dodge their attacks and proceeded to take them out. They kept going, being careful of some Mega Moles, and proceeding to run into more Charging Chucks with a Beowolf next to them, but they quickly disposed of them.

"Okay, seriously, what's with the Charging Chucks?" Sun asked.

"They probably love it here. Or maybe many were stationed here…? I dunno." Luigi shrugged as they saw several Charging Chucks smashing several blocks with ease. "…I'm probably going with the former." He said as they took care of them as they kept going through the cave as a Swoop decided to land on Grif's head.

"Uh, Grif… you got a little…" Church tried to say.

"A little what?" Grif asked.

"A little-"

"You got a bat on you, doofus!" Sister shouted, causing Grif to pale… and started screaming like a girl.

"GET IT OFF! GET IT OFF! GET IT OFF!"

"…Did he just scream like a girl?" Sarge asked.

"Ooooh! Black mail!" Simmons chuckled.

"FUCK YOU, SIMMONS!" Grif yelled, managing to get it off of him as they went onward until they eventually got through after dealing with many Charging Chucks and they kept going, making sure none of the Charging Chucks were following them… but then they saw the next thing up ahead.

"…Oh, this is going to be fun. NOT." Weiss groaned.

World 7-3: The Ceiling and Floor are… Moving?

"This is gonna take a while." Yang said as Nora tried to bust a hole in the water with her hammer, but nothing cracked.

"Aww… no shortcut." Nora pouted as they wandered in… and waited… and then wandered some more… yeah, you get the idea.

"Augh! This is infuriating!" Sun exclaimed.

"Right?!" Neptune agreed.

"You gotta practice patience." Doc spoke up.

"…Where'd he come from?" Sun asked as Neptune shrugged as they kept walking as the ceiling and floor allowed, until finally, they came to an opening as they wandered forward… only to find that they had to do it again, much to their annoyance.

However, RWBY, Mario, Luigi and Nyx spotted a secret pathway as they hopped on in and ran forward until they came across a key and a keyhole as they picked it up and put in the Keyhole, causing a Warp Pipe to appear as they hopped on in.

End BGM

When the seven hopped out, they saw a tower right in front of them. "Sweet, a tower!" Yang grinned.

"Heh, alright, let's do this!" Ruby smiled as they nodded and they ran in.

World 7-Tower: We've Had it with You!

BGM: Tower (New Super Mario Bros 2)

"Huh, Skewers that are… a little faster." Ruby pointed out the obvious.

"This shouldn't be too hard." Mario said.

"Just annoying." Weiss said as they proceeded onward, and with the help of Nyx, they quickly got out of the way of the Skewers while being wary of the Podoboos happily jumping out of the lava and they kept going, jumping over the lava pits and dodging the skewers with ease, although with some difficulty, but they eventually made it through the doors.

End BGM

"Ehehehe!" A voice cackled and then Kamek appeared.

BGM: Kamek (Paper Mario: Color Splash)

"You…" Blake whispered.

"Yes, me! Happy to see you!"

"Alright, so we're taking you on?" Luigi pulled out his hammer. "This is going to be easy!"

"Ehehe! Easy for you to say, greenie!" Kamek smirked, aiming his wand at them. "Now, let's get this star-"

Suddenly, they heard a voice from above, causing them to stop and look up.

End BGM

"Ack! Stop pushing!"

"You stop pushing!"

"Who's bright idea was it to go inside this ventilation system again?"

"…Don't you give me those looks!"

"Uh… guys, I think our combined weight is making this vent weaker."

"Oh, don't say that! I'm pretty sure it's fine!"

Suddenly, a grate from the vents opened up. "…None of you. Say. A." He fell. "WOOOOOOOOOOOOOOOORD!" He yelled and fell right on top of Kamek, and three other Koopas landed right on top of him.

"GAAAAH!"

BGM: Koopa Bros. Keep Cool! (Paper Mario)

"I didn't tell you to fall after me!"

"Well, excuse me if I can't control where I fall!"

"…These morons again?" Weiss asked, catching their attention.

"What the…?" Red looked at them. "What the heck are you guys doing here?"

"We'd ask you the same thing." Mario said.

"Well, we decided to have our revenge on you female punks for dissing us like that after you beat the snot out of us!" Red said. "We don't take kindly to that. However, as we were trying to follow you, this Koopa danged Island kept smacking us left and right like no one's business! Seriously, this island is cursed!"

"Cursed?!" Luigi paled.

Nyx rubbed her chin in thought. "Wait, what happened to you?" She asked as they explained what had happened to them. "Oh… I think those events were done by us."

"WAIT, YOU WERE RESPONSIBLE FOR THAT?!" Yellow yelled.

"Oh, why you dirty little…!" Red growled. "That's it! We're going to tear you into pieces and clobber the Mario Bros while we're at it!"

"C-Can I have a say in this?" Kamek asked.

"Heck no, grandma!" Green exclaimed. "This is where we shine!"

"GRANDMA?!" Kamek yelled. "I'll have you know that I'm a guy and I'm not even that old to begin with! I better put you in your pla-" Something else landed on him, and it was Nabbit. "OOOF!"

Nabbit blinked, looking around and then said something unintelligible before siding with the Koopa Bros, not knowing what he's actually getting into.

"Heh, look at this guys, we got ourselves a member!" Black grinned.

"…He ain't a Koopa, but it'll do for now!" Red said. "Now, time for our revenge… and our dignity!"

"Ready?" Mario asked as they nodded. "Alright, let's-a go!"

End BGM

BGM: Attack on the Koopa Bros (Paper Mario)

The quintet split up as Mario and Ruby proceeded to deal with Red as he spun in his shell and attacked them, but Mario hammered him away, but Red recovered as he jumped up and did a front flip, proceeding to kick Ruby in the face, but she slashed him repeatedly and then kicked him away where Mario hammered him in the head. "Gah!" Red growled and then ran forward, proceeding to punch Mario but he blocked the punch, only for Red to knee him in the gut and did a backflip to knock Mario back.

Weiss put down an ice field to have Green slip, but he jumped over. "Not gonna work this time, princess!" He said, but Luigi jumped over Weiss and hammered Green down to the ice. "OOOF!" He yelled and got up, only to slip as Weiss fired icicles from her glyphs and then Luigi ice skated before kicking him away.

Yang punched Yellow repeatedly as he dodged every punch and then used an uppercut to knock her up as he jumped up to punch her down, but she was ready for this and fired her Gauntlet to hit him, which it did as she quickly flipped to land back on her feet while Yellow did the same as they both ran straight for each other and punched each other repeatedly, knocking each other back.

Black kicked Blake, but she disappeared and then reappeared behind him to kick him before slashing him with Gambol Shroud and then she shot him, but he quickly cartwheeled out of the way. "Hmph! Is that the best you got? You've got a lame weapon anyway!"

Blake gave a deadpan look before she summoned her Belladonna Claws.

"…That's a new one." He said as they proceeded to fight again, only this time, she kept slashing him with her claws, scratching him all over the place. "Yagh! If I didn't know any better, you fight like a puma!"

"What does that have to do with anything?" Blake asked as she proceeded to slash him… and as for Nyx, she was having a hard time attacking Nabbit as he kept dodging the attacks and running around before swinging his bag around and throwing it, but she ducked.

"Got ourselves a live one here." Nyx said as she fired from her crossbow, but Nabbit jumped and then landed in front of her, giving her a friendly wave. Alright… She thought, bringing out her pistol and put in a magazine full of fire dust and shot him, but Nabbit was quick and ducked. "…What?!" She asked as Nabbit hopped up and decided to go for a piggy back ride on her shoulders. "Hey! Get off of me!"

Kamek got back up, groaning to himself and then watched the battles before him. "Hmph! I'll show them!" He said before aiming at Mario and Ruby. "But first, I'll get rid of the-"

"I SAID, GET OFF!" Nyx yelled, throwing Nabbit off of her and he smacked into Kamek.

"OOOF!" Kamek yelled, falling unconscious as Nabbit got back up and ran back to her.

Ruby used her semblance and then kicked Red into the air before slashing him repeatedly and then Mario jumped over and hammered him away, where Red smacked into the other Koopas. "Argh… you thinking what I'm thinking?"

"Way ahead of you!" Yellow nodded as they stacked up on top of each other.

"Sayonara, losers! We're the superior ones here!" Red said as they began charging up as they got ready for their ultimate attack.

Nabbit reached into his bag and then threw coins at Nyx which she caught, but then sensed spiked balls coming toward her as she dodged each one before she fired an arrow which hit Nabbit's bag and pinned him to a wall, causing him to pout as he tried to get himself unpinned.

"HERE WE GOOOO!" Red yelled, but one of the spiked balls hit them from behind, knocked Red off. "OOOF!" He yelled… aaaand then he got ran over. "AAAAAAAAAGH!" He yelled as Yang punched the ground to topple the rest of them down as the others proceeded to gang up on them to defeat them once and for all.

End BGM

"Oooow… ran over by my team…" Red groaned as the rest were on the ground, defeated.

"I'm gonna… feel that one in the morning…" Green groaned.

"Alright, let's go." Nyx said as they took off while the others lay there in defeat.

"I never got my chance to attack…" Kamek groaned as Nabbit got himself unpinned, but his bag had a small rip in it, causing his eyes to water and pouted, horrified that his bag was ripped.

"Uuugh… next time… we'll strike even harder…" Red groaned. "But first… we need to get off this island."

"Agreed." His team agreed.

With the others…

"Wait, a back door?" Nyx asked as they realized that they were at the back door of Bowser's Castle as they looked to the side to see they were on top of a cliff, and when they looked down, they saw the army of King Taijitus and Deathstalkers before them, guarding the entrance.

"…We might have to come back to this later." Mario said.

"Right. Let's go tell the others." Ruby said and they took off to tell the others.

"So, does that mean we have to go through that annoying section of the cave again?" Weiss asked, causing the others to groan.

"I hope it's not as bad as before…" Luigi hoped and they kept going on, not knowing how far ahead the others were.

When opportunity knocks for lore, I answer!

...That sounded better in my head.