I'll Make Them Whole

As the six heroes exited the Changeling Kingdom, the moon began to hone in on them. Mario sensed it, and he looked upwards, but it was too late. The massive explosion was heard by several Necromorphs, willing to feast on some ponies.

Oh, crap. That moon came out of nowhere. That was definitely loud enough for Necromorphs to hear. Time to fight.

The Necromorphs tried to bite into Mario, seeing as how he had the most meat on his bones, but... they couldn't. Mario was FAR too fat to get bitten. His neck is the only part of him that's not so fat. "Uh... is this supposed to hurt?", Mario asked. However, one Necromorph bit Mario so deeply, it began to catch fire. The Necromorph ran around in a wild frenzy, accidentally incinerating its Necromorph brethren. What followed was a hilarious carnage of Necromorphs getting incinerated left and right. Mario laughed at the "stupid aliens", not remembering that they were once ponies and other Equestrian creatures.

"Well... good job, Mario", SMG4 said.

"I am in incredible pain!", Mario said jovially.

Meanwhile, SMG3 was using the YouTube remote to literally erase several Necromorphs from existence itself. He then summoned a bunch of Ugandan Knuckles, which overwhelmed the Necromorphs. The Necromorphs might've been able to handle Isaac Clarke, but they weren't prepared for this. The Necromorphs whimpered and whined as Mario and SMG3 completely annihilated them. However, the Ugandan Knuckles army all got bitten, making them go feral. "Well, shit", SMG3 said in a monotone voice. He summoned OOF Buttons, which quickly disposed of the infected army by sending them to the Shadow Realm. The OOF Buttons retreated afterwards. However, unbelievable devastation still surrounded the six heroes. However, a rumbling was felt.

"Whoa! What was that?", Applejack asked. She got her answer VERY quickly as a giant monster burst from the ground.

"A Slug! Attack!", Isaac responded as he used his Plasma Cutter to slice into the monster's tentacles, to no avail. Mario used fireballs to try and incinerate the Slug, but it simply batted the fireballs away. SMG4 went Super Saiyan Blue and fired a Kamehameha, which actually did some damage... but he hit the monster's face instead of the tentacles. "You idiot! The tentacles are the weak point!" Mario went Super Saiyan 3 and fired a Kamehameha, and this time, one of the tentacles was destroyed, causing the monster to roar in pain. "Yeah, like that!" Rainbow Dash used her incredible speed to create a tornado which blinded the Slug, causing it to growl in confusion.

"Hey, ugly!", SMG3 shouted. He turned his Eggdog into a sword and sliced another tentacle off the monster, causing the monster to once again roar in pain.

"What is that thing, anyways?", Isaac asked.

"My pet", SMG3 responded. Applejack leaped onto the monster to try and lasso it to the ground, but a tentacle impaled her, causing her to scream in pain. The monster, however, got some karma as the tentacle Applejack was impaled on got sliced off... by a mustache. Mario caught his mustache as if it were a boomerang and put it back on his face. But it was too late. Applejack was dead.

"No... NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!", Rainbow Dash screamed as she picked up speed around the monster, making the tornado more intense. She then rammed into the monster, literally using her own body as a weapon to break off another tentacle.

"One more, guys!", Isaac shouted. He leaped onto the monster's last remaining tentacle and sliced it clean off.

"Now, Mario!", SMG4 shouted. Mario flew straight into the monster's mouth, and what followed was a gargantuan explosion of fire and guts as the Slug's dying screams echoed throughout the Changeling Kingdom.

Holy shit. I knew Mario was powerful, but I've never seen anything like this.

Mario stood in the center, body aglow with his blood boiling from within. Mario has set his blood on fire to destroy the Slug. "Anime", Mario said. He and SMG4 powered down. Unbeknownst to the duo, though, Rainbow Dash was mourning over Applejack... who had transformed into a Necromorph. The Applejack Necromorph sprouted eight additional legs from its sides.

"No... I can't...", Rainbow Dash cried. She held out Hope in front of her. "Look at her! Please try to remember!" Tears streamed down Rainbow Dash's eyes as she attempted to make the Applejack Necromorph remember, but all the monster did was stab the left wing, forgetting that Rainbow Dash now had mechanical wings. The Applejack Necromorph, realizing that it fucked up, tried to remove its leg from the wing, but it didn't work. However, Rainbow Dash then did the unthinkable. She grabbed another leg and used it to stab herself in the neck. She tossed Hope to Mario. With one last smile, she blitzed around all of Equestria at an impossible speed in a straight line, causing her flesh to peel away, while at the same time, the Applejack Necromorph began to die alongside Rainbow Dash. "I love you so much, Applejack. We deserve to be together... even if it's not on this plane of existence." Rainbow Dash then launched herself and the Applejack Necromorph beyond the stratosphere and straight into the Sun, and both the Applejack Necromorph and Rainbow Dash screamed in pain as Rainbow Dash slowly started to transform into a Necromorph. Her screams of pain became muffled as the flames engulfed her, not realizing that the mechanical wings were actually creating armor that not only protected her from the Sun, but also reversed her transformation. The Applejack Necromorph, however, wasn't so lucky. The Applejack Necromorph was fully obliterated thanks to the heat of the Sun.

Back on Equestria, Rainbow Dash, now in full body armor, landed on the ground, leaving a giant crater in her wake. The armor deactivated. "Wait, I'm not dead?", Rainbow Dash asked.

"Those wings of yours... I think when one of them was stabbed, it activated a defense mechanism", Isaac said.

"No... I was supposed to die... with Applejack...", Rainbow Dash said as she sobbed quietly.