"There is no question that Cursa is more powerful, cunning, and relentless than any single one of us, yet together - with aid from Rosalina - it was vanquished. Still, its corrupting influence reached every corner of the galaxy, where much of it lingers still. We have stopped the Darkmess at its source, but we have much work to do if we are to remove the rest before it can cause any more harm."
The above text is from the Super Mario Wiki and is available under a Creative Commons license. Attribution must be provided through a list of authors or a link back to the original article. Source: https/Cursa
By the way, spoilers from included and/or represented works abound. Please read this fiction carefully.
The Sparks are excited to help the pilots!
"Yes! Finally!" Amuro Ray is relieved. "Now we can finally properly damage the threats!"
"Finally... the Supreme God will be put out of misery!" Saint Advent shouted through Akasha Terminal.
"How you contact to us again with Akasha Terminal?" Fei questioned.
"We remembered about the Sparks." Princess Peach explained. "Thanks the Library, the Rabbids and the Launch Stars for summoning the Sparks."
"Heh, who's talking now?" Gebura smirked. "Do the Cross All, the same ability the alliance used against Shinryu last night!"
"Here's the refreshers: Cross All is basically the fusion of all energies and powers a group can form." Malkuth explained. "Good luck taking it for granted!"
"Understood!" The Sentais and the Rangers replied. "Everyone, Cross All!"
"How could you!" Cursa then hastily tried to tear the mechas apart.
Zenkaiju-Oh simply fired Zenryoku Max Blaster, destroying the Astral Hands. Cursa bluntly absorbed some loads of Sparks as a response.
"As suspected, she's absorbing the Sparks!" Marina noticed. "Everyone, Cross All!"
The pilots m and their mechas did Cross All, connecting and fusing all their powers and energies with that of all the Sparks on the battlefield... and Galactus, because...
"I bless you my powers, robots, so go ahead and finish it!" Galactus told the pilots. "And curse you, Cursa!"
"Thanks, Galactus!" Masaki thanked Galactus.
The mechas effortlessly defeated the threats, and gauged in against Cursa.
"How dare you destroy my legion!" Cursa got aggressive, and turned into the bird-like form. "And you're even countering the Darkmess!?"
Cursa then absorbed all the threats that the mechas and pilots just defeated as well, gaining all their powers and abilities but cranked up beyond all previous limits.
"Cursa, leave Rosalina fucking alone!" The Sentais shouted profanely. "For justice, for peace, and for the omniverse!"
The mechas fought Cursa to the standstill, and both sides didn't stop getting all more powerful and more brutal yet more diligent.
In the Library...
"Supply all with Sparks!" Roland commanded the Abnormalities. "Do you want to save Rosalina and help save the reality!?"
Roland then sighed and walked away. He's tired now.
"Roland, we hope they could destroy Cursa and save Rosalina." Angela said.
"Me too." Roland replied.
Ingrid entered the Library with the mysterious cube floating behind her.
"A man named Goshikida-Tsuiker bright me my own creation." Ingrid reported.
"Hello, I'm Goshikida-Tsuiker, or Go-Tsu for short." Go-Tsu introduced himself. "Nice to meet you."
"I'm Angela, Manager Assistant and Library Director." Angela introduced herself.
"And I'm Roland." Roland then welcomed. "You're welcome."
Go-Tsu then showed Angela his Geartlinger.
"You're Zenkaiser?" Angela asked Go-Tsu. "I think he's in a mission to save someone."
"I'm from the future." Go-Tsu revealed. "The original Zenkaiser is my ancestor."
"You're a descendant of Kaito Goshikida!?" Roland is shocked.
"How do you know his name?" Go-Tsu is surprised.
"He must be Zenkaiser!" Angela told Go-Tsu. "You said you're his descendant?"
"Yes. Kaito Goshikida is my ancestor. The original Zenkaiser." Go-Tsu discussed about his ancestry. "I'm a few centuries into the future, after over 10 generations of carrying on the legacy."
"I have the power of all Super Sentais in all of existence." Go-Tsu continued.
"You must be at least two centuries into the future!" Roland guessed.
"Yes, but I am planning to give the powers to my son who's currently attending elementary-school. Recently, he has been missing." Go-Tsu replied. "I needed to find him. That's why I had to see how."
"Your son?" Angela thought about it. "We suspect that he, Go-Tsu Jr., is being kidnapped by a woman named Ikue Higashi."
"We only met 'Ikue Higashi' once, and she has transformed into a magical girl called 'Cure Union' apparently." Roland explained what happened.
"Why use Pandora?" Ingrid asked Go-Tsu.
"I suspect that she's trying to pin that box down, so I had to track it." Go-Tsu replied. "Anyways, most people thought that Ikue Higashi never existed..."
"That's suspicious." Roland replied. "Pretty Cute that never was?"
Meanwhile...
"Rosalina! Get your senses back!" Setsuko pleaded.
"Rosalina is done. Cursa is the one!" Cursa is angry. "The Darkmess is all!"
Cursa absorbed more Sparks and enlarged itself, totally dwarfing even the enlarged Zenkaiju-Oh.
"She's getting bigger and bigger!" Dragonranger and KibaRanger, as the Kiden Ryujin steps back and...
"Ouch!" Kiden Ryujin collided with White Tiger Dragonzord.
This caused the said mechas to shine bright, and have the two merge. The result is Kiden Ryujin and White Tiger Dragonzord in one, with the same looks and even the same cockpit... though Dragonranger and KibaRanger is now in alongside Green Ranger and White Ranger, respectively.
"Look! The Zord just combined with its counterpart!" Beep-O noticed.
"What!?" Dragonranger, KibaRanger and Green Ranger, White Ranger, all shocked.
"Because they're technically the same, just...!?" Beep-O is surprised.
"Beep-O! So the Megazord and the Robo has fused, and they were each other's counterpart, so..." Barrel noticed something. "That's it! Totally equivalent Megazords should be fused with its Sentai Robo counterpart!"
Daizyuzin and the original Megazord suddenly combined in the same manner, with the equivalent results (with negligible difference between counterparts)
"Unbelievable!" The (main) Zyurangers and the original Power Rangers are surprised.
"Kiden Ryujin: Tiger Dragon!" Jeanie introduced. "And... Shinka Mega Daizyuzin!"
"Jeanie, you're naming the fused Zords?" Beep-O asked Jeanie in sudden curiosity.
"Thunder Dairen'Oh, Tor Daimugen, Shogun Muteki, White Ninja Tsubasamaru, Kakure Ninja, Zeo Ohranger Megabattle Buster and King Pyramidas, you're next!" Jeanie declared.
Cue the said combinations.
"Dude, we're actually fusing Megazords with their true equivalents!?" The Zenkaigers and the neo Power Rangers questioned.
"You have to! This greatly increase the chance of success-" Jeanie confirmed-
Suddenly, Ultra Gosei Great Grand Megazord and Gosei Ultimate Command Ship got summoned from Megaforce Rangers, then fused with Ground Hyper Gosei Great and Gosei Ultimate respectively, becoming Ultra Gosei Great and Gosei Ultimate X (or Shin Gosei Ultimate). Jeanie laughed at the combinations-
"Shut up, Jeanie, stop being cringy." Beep-O interrupted Jeanie.
"Oops, sorry..." Jeanie apologized, while Ultimate Legendary Megazord combined with Kanzen Gokai-Oh to become Ultimate Legendary Gokai-Oh.
"It's not your fault. It's just... uh, you have more emotions." Beep-O commented. "I'm proud of you."
"Now we know what we're going to do." The Gokaigers and the Super Megaforce Rangers understood. "Megazords, combine with your true equivalents!"
The main Megazords then gathered together into their strongest forms compatible, then combined with their counterparts. Mega Megazord is brought back by Sparks instead.
"Gao-Animus, Hurricane Tenrai Senpuujin, Valkasaurus OoAbaren-Oh, Triceramax-RyuuOh, Delta Max Dekaranger Robo, Manticore MagiLegend,... and so on." Deadpool learned about the combinations. "Oh my god, brain overloading!"
"Dino Charge... Gigant Kyoryuzin!" The Kyoryugers interrupted the Dino Charge Rangers. "Everyone, let's barrage it the brave way!"
The fused Robos are much more powerful than their counterparts combined, and it's aided by the Cross All ability. Cursa is overwhelmed, forcing to increase the size evn further to compensate.
"No! I won't allow you!" Cursa is enraged. "I will destroy all hope! Just you brace!"
Minutes later, Cursa has dwarfed the Milky Way, which is vastly larger than the Taa II worldship. At that point, Cursa is finally resistant.
"You've left us no choice but to combine!" Team Dai-Gurren declared.
"The galactic combination shall commence!" Donbrothers in Toradora Onitaijin. "Everyone, now!"
Arc-Gurren appeared with Team Dai-Gurren onboard, so Gurren Lagann (piloted by Simon and Viral) combined it to become Arc Gurren Lagann. The combination then wore Zenkaiju-Oh like a backpack.
"Arc Gurren Lagann! Zenryoku Pack!" Team Dai-Gurren and Zenkaigers shouted.
"Thank you for riding. Super Galaxy Dai-Gurren has arrived." ToQ Ressha announcements. "Everyone onboard."
All the mechas from worlds all landed in Super Galaxy Dai-Gurren, with Arc Gurren Lagann being the most prominent as it and Gunbuster and Dix-Neuf and Buster Machine No. 7 are doing the Gunbuster pose on the front of Cursa.
"Who do you think we're!?" Zenkaigers, Team Dai-Gurren, Noriko, Kazumi, Lal'c Mellk Mal, Dix-Neuf and Nono/BusterNo.7 questioned Cursa.
"You're the hope that can never truly be!" Cursa then tried to to fire laser towards the mechas.
"Chouginga Zenryoku Dai Gattai!" Donbrothers shouted.
Super Galaxy Dai-Gurren then absorbed the mechas and and transformed into Super Galaxy Gurren Lagann, but combined with the mechas and Zords as well, with those components inside, including Kamen Riders (involved), Super Sentais, Power Rangers, and mecha pilots from several worlds as involved. (Yes, even Omikoshi Phoenix!)
"Complete! Super Galaxy! Zenryoku Ikki-Tousen! Tora-Dragon! Onitaiji!"/"完成！ 超銀河！全力一騎桃千!虎龍攻！鬼退治!" Super Galaxy Gurren Lagann emerged, but with face of GolDon Onitaijin but with the star-shaped sunglasses, and torso armored with ones of Toradora Onitaijin but sporting the luminous cyan version of the giant sunglasses. "Super Galaxy Don-Zen Onitaijin!"/"超銀河ドンゼンオニタイジン!"
"Ugh! Damn you!" Cursa tried to destroy the combined mecha.
The mecha raised hand, and the laser fire by Cursa is suddenly blocked upon contact.
"Spiral and Sparks in unison!" Autumn-Four explained. "That's how it worked!"
The two drills on the mecha's shoulders then shone with an ultra-bright white light, so bright, it instantly blinded Cursa. Those combined on a single hand attack...
"Zenryoku DonBro... Sparkling Giga Drill Break!!!" Drills through Cursa, and getting inside.
"Woah!!!!!" The mecha pilots suddenly ejected from their mechas, as all fell into Cursa.
"Hold on!" Ohma Zi-O assured. "Brace yourself!"
The pilots then fell to a zone similar to Cursa's stronghold. In the middle, there's a bubble of darkness covered by Darkmess Tentacles.
"Those robos... Can you hear me?" Beep-O called.
The Donbrothers then recovered up.
"I'm hearing you, Beep." Taro Momoi, DonMomotaro, replied. "We've the coordinates. Can you teleport your friends there?"
"Ok, let's me check..." Beep-O then calculated the coordinates.
Various Sentais and Riders then stood up.
"Yeah... Rosalina must be here." Zenkaiser looked out.
takes the Almighty Seiken* "Rosalina is being controlled by Cursa, indeed." Saber replied. "Why did Cursa return despite being destroyed as a source?"
"Someone most likely took the remaining Darkmess and surged it." Twokaiser guessed. "That's the only possible way for Genjitsu-no-Omnia to take advantage of the Darkmess from somewhere and thus revive Cursa without directly breaking the timeline involved."
"Cursa returned because of some of the remaining Darkmess we were trying to remove." Beep-O confirmed.
"What you just guessed is the only plausible possibility. Therefore, it must have happened." Jeanie commented. "Your current battle is one of possible consequence of forgetting to remove the remain Darkmess."
"The Darkmess, if left unpurified, can corrupt things." Beep-O explained. "Hence, we had to destroy or purify all the Darkmess."
System No. XX, Mario, Luigi, Princess Peach, Bowser, Rabbid Mario, Rabbid Luigi, Rabbid Peach, Rabbid Rosalina and Edge the Rabbid all appeared.
"Rosalina... We're here to free you." System No. XX summoned something...
"Kousako, is that... Rosalina's wand?" Rabbid Rosalina noticed.
"Time to intersect." System No. XX holds the wand in mouth and summoned Aramasa.
"That's Mr. Bloodedge's weapon!" Saber noticed.
System No. XX approaches the bubble, and then stanced for...
"Black Onslaught."System performs Ragna's Astral: copying the fullest might of the Azure Grimoire from him and turn the blade into a scythe and proceeds to repeatedly slash with it, using Soul Eater to empower it. Then transforms into...something, and unleashes a final strike that would typically... completely erases the opponent from existence.
The Astral destroyed the Tentacles and the dark bubble got destroyed, revealing Roaslina in purple version of her dress, and red eye(s).
"Cursa, we will exterminate you!" Mario, Zenkaiser, Saber and their allies approached.
takes the wand into hand* "Cursa, leave Rosalina alone and begone." System No. XX aggravated Cursa.
Rosalina wakes up, and revealing her red eye(s).
"I am Cursa, the end of all cosmic hope!" Rosalina is fused with Cursa, not just possessed anymore.
"Rosalina is consumed by the Darkmess." Edge the Rabbid noticed. "Let's free Rosalina."
System No. XX waves the wand, creating six large starlight-colored copies of it around Rosalina/Cursa.
"Look at the those projection." System No. XX told everyone. "Supply both Sparks' powers and Cross All from everywhere around, and even the mechas, and you should be able to destroy Cursa for real good."
"I'm gonna kill you all!" Cursa then casted Darkmess-powered spells to go against the group.
"Get ready!" System No. XX and Edge the Rabbid shouted.
The group is ready to rumble, with Saber able to unleash the empowered Haouken, and Zenkaiser and Twokaizer got both Super gear and Zenryoku Zenkai Cannon to roll. Everyone went fighting.
More Sparks appeared near the combined mecha, and went on to harness Cross All, imbuing the group with powers to destroy Cursa once and for all and save Rosalina for real.
"Go, Sparks, go!!!" Rayman cheered from afar.
giggles* "Such interesting rumble." Hilda poked fun at the battle.
"Let's hope the unity erase Cursa!" Rayman exclaimed.
"Geez, it's pretty rudimentary for an alliance to hope things as successful as such." Hilda cringed at Rayman.