The numerous continents of Terraria continue to be in conflict as the forces of The Underworld run rampant on the planet’s surface. Not even underground biomes are spared as they too are being invaded by these forces. From Shroom’s very own Mushroom Village within the Glowing Mushroom Biome to even the depths of The Dungeon.

Not even the oceans are spared as aquatic demonic entities swam through the seas with ease; in addition to the Sunken Seas. Although these encounters varied from certain bodies of oceans:

In the Sulphuric Seas, the demons manage to kill and devour various forms of sea life. However, there was one who became incredibly angered by the arrogance of these invaders. A being whose appearance seemed to radiate years upon years of experience, and wisdom. Needless to say, its’ wrath passed swiftly upon its invasive foes.

In addition, there lies another entity that swallowed demons whole with a single gulp; in a fashion similar to the Desert Scourge. This was appropriate as the large serpentine entity did indeed have some relation to the former scourge of the desert, but a more aquatic variant.

……….

Although there are many bodies of oceans upon Terraria, there exists one that’s overseen by an ancient being. This feminine figure sang beautiful lullabies that drew in would-be adventurers and sailors, or in this case, invasive demons of aquatic variations. The cadence of her tone is even powerful enough to entice the demons themselves.

As the demons become enthralled by her seductive lullaby, she raises her trident high into the air while bearing a condescending smile. From a bird’s eye view, a shadowy figure could be seen rising from the depths. As it gets closer, the size of this shadow grew ever larger before the agape jaws of an enormous leviathan are the last thing these demons would ever see.

……….

In another body of ocean water, King Amidias’s forces waged war against the demons. Merfolk riding upon the backs of numerous sea life engaged the invaders, spears and magics at the ready. However, fighting alongside them are very familiar entities from Equus: Hippogriffs.

……….

Biomes of every type are also being dragged into the conflict as within one of the many Snow Biomes - which also happens to be the same one Applejack, Fluttershy, Pinkie Pie, and Ritsu once visited - a large sentient fortress froze its enemies in mere seconds before shattering its foes with ease.

As the fortress unleashes its wrath upon its demonic foes, a gathering of yaks, ponies, and other sentient races from Equus could be seen retreating from the conflict. The unification of the two worlds had displaced a large assortment of life from Equus; placing them all across Terraria in a near-random fashion.

……….

In a Jungle Biome to the far east, Queen Bee 626 and their legion of hornets combat against the Underworld’s forces. Most notably, however, are the equine-like beings who fought alongside them; those hailing from Equus: Changelings.

……….

In yet another Jungle Biome, which happens to be the very same one Zecora calls home, and where the battle with Queen Beezma once took place within its underground counterpart, Lihzhards emerged from their temples to savagely assault the invaders. And in many instances, these lihzhards were already waiting for the demons to arrive as if someone or something had informed them of their arrival.

At the precipice of one of the temples, a male lihzhard dressed in ceremonial attire raises their arms in a near worship-like fashion.

“These demonic fools will not prevent our attempts for your return, Lady Planterra! The world shall see that there is only one true embodiment of nature!”

“As you can see, my dear reader... or as I like to call: Observer - yes, I am aware of your presence. You who gaze upon this ‘story’, our universe; looking upon us all like an audience at a theatre."

"Forgive the intrusion, but I wanted to pull you all aside and have a little chat. Indulge me for a moment.”

A male’s voice that’s deep, smooth, and echoing comments from within a sudden mist.

“The demons have indeed targeted all of Terraria, I assure you. Do not think for a second that this is only happening in Camelot’s borders. Terraria is a vast planet, after all. And while some are achieving victory across the land, there are many who are dying at this very moment. Thus is the result of any conflict.”

“Hmmm, some of you must be confused about my awareness, though you’ve already met others who can also see beyond the wall. And in doing so… we can see you. Do not fret, reader, for even if I wanted to harm you - which I don’t - there is simply no way for me or anyone in this story to do so. You are simply beyond our reach.”

The voice chuckles.

“Although, to be fair, none of you could actually harm us as well. You can’t enter our reality any more than we can breach into yours. So let’s speak respectively.”

“I have long since accepted that the omniverse is vast and infinite, filled with endless possibilities. And you, observer, are a being far more powerful than any of us within this ‘story’. You are capable of watching our universes without many consequences, and no matter how hard any within our reality may try to ‘threaten’ you, they never will. That’s the thing about stories: each one gives rise to another universe, along with other possibilities attached to that in divergent paths, and gives you a window to peer into them.”

“Even the smallest action can give rise to a whole new universe, but I can not help but wonder: Do you believe in that? Do my words spark curiosity in your hearts? Or are they but the ramblings of a character you deem to be non-existent, fictional?”

“Regardless of your answer, it is a fair one. But keep this in mind: where you can observe us ‘characters’ in this story, a higher power is watching you all the same. After all, there’s a saying that I find most appropriate:

‘If you don’t have your own story, you become a part of someone else’s.’

I like to apply this on a far grander scale.”

“Ah, do forgive me. Despite my appearance, I often fall prey to conversation. Allow me to give you a full view of my very own realm, and to show you what I look like. Although I’ll have to use a form you’re all too familiar with.”

“You see, applying a physical form to me is complicated. And although many associate an infinite number of eyes and tentacles with my existence - albeit this isn’t entirely wrong - I am more of a ceaseless; nameless mist. Similar to what you’d often find in the confines of Space, but uniquely different.”

In one swift occurrence, a whole new world practically explodes into view as green skies become all too apparent. This infinite plane of reality is dominated by an endless, roiling sea of toxic green liquid, where giant oily tentacles slither and writhe about the waves. What little ground there is consists of several archipelagos and cathedral-like buildings composed of heavily weathered stone, connected by constantly shifting bridges built of greasy black metal. Several bridges and hallways even move on their own, stretching and bending like tentacles to render other areas accessible or hinder intruders.

But the most prominent feature, however, is the overwhelming abundance of books that make up what’s, seemingly, a very unique library. Giant stacks of reading material break the surface of the poisonous sea, numerous shelves that line the halls and walls are literally crammed to bursting with ancient scrolls and smoldering journals, heaps of books and papers litter the floors, and even entire buildings are constructed from twisting stacks of books.

Overlooking this realm is a pony-like figure who floats in place, their back turned towards you. The dark-green earth pony stallion looks over their left shoulder, gazing back at you with a vibrant yellow eye. His cutie mark an open book with black tentacles all around it.

“Welcome to my library, observer. My very own plane of existence, Apocrypha. Now then, before I send you all on your way, I suppose a proper introduction is in order.”

The earth pony stallion bows towards you by lowering their forehooves before rising up again.

“Names are a powerful thing for my kind, but for all of you, I give it willingly. Besides, you’d all sooner or later come to learn it. Or perhaps you already do? Truly, you all fascinate me, observers. There is much we can learn from each other, and acquiring new knowledge is always a treat for me.”

“I have many titles, but I was never one to recite them. Nor do I care much for them, unlike many of my more prideful brethren. I am simply referred to as... Yog-Sothoth, Outer God of Knowledge.”

The dark-green coated stallion turns around once more, “Let us continue to observe, together. Soon, I will be free to leave my realm and enter Terraria once more. And when that time comes, your essence, your soul... everything about you will belong to me… Nyarlathotep.”

Yog looks towards the empty shelf alongside him, directly to his right, “I even have a special shelving in place... just for you.”

-TERRARIA, THE UNDERWORLD-

The group now stood before a large pool of lava as glooping sounds emanate from the liquid hot magma.

“I guess this is goodbye, everyone,” Tanner the Doll comments, held within Pound Cake’s arms. “I’m sorry that I didn’t get to know you all a little better. But, alas, my time has come…”

“Is there truly no other way?” Rainbow Dash inquires.

“The Queen was mighty clear, R.D.” Applejack responds in regret. “Besides, if what Tanner says is true, then that Daedalus feller sounds like he’ll be a big ol’ help.”

“Not to mention that other guy,” Pinkie Pie comments.

“Ah, yes,” Twilight said. “This Outer God of Knowledge… b-but, Tanner… can we really trust this being?”

Everyone turns towards Twilight in response.

“I don’t mean to sound rude, and I know we shouldn’t judge someone by their origins. But if he’s an Outer God, isn’t he, well, dangerous?”

“Do you remember what I told you, Starlight, and Zecora?” The Doll responds.

“Y-yes, when we were still imprisoned here.”

Starlight winces in response, but a comforting wing from Shadow Thunder causes her to perk up. Although Venomous gags in disgust, causing Celebes to elbow him. Arche is seemingly bored out of his mind, although he does comment:

“Man, I wish I had my chaos powers right about now…”

All the while, Celestia, Luna, and Cadence continue to seem very cautious about their surroundings. Flame Heart, Tzana, Braelor, and Tempest standing alongside them.

“By our mother and father… this place is far more horrifying than even Tartarus,” Celestia comments.

“Indeed,” Luna responds. “Tis far more foreboding in comparison to our own realm of the damned.”

“The Underworld even expands into a large multitude of universes,” Braelor said. “Lucifer was very ‘creative’ when he breathed this place into existence.”

“All this talk about universes and powerful beings breathing whole realities and realms into existence… I can’t help but feel, small...” Flame Heart states.

“Can’t really say I’m surprised,” Tzana comments. “I mean, Harmony created our universe, before it got sucked away by that red light. Only seems natural that the world she was born into is much more complicated.”

“And much more dangerous,” Tempest responds, followed by a smirk that forms onto her muzzle, “I think I like it already.”

Cadence lowers her head in absolute worry, “Flurry Heart… please be safe…”

……….

“Whatever do you mean, darling?” Rarity questions The Doll.

“We told you guys all about me, Starlight, Zecora, and Tanner being trapped down here,” Twilight responds in Tanner’s stead. “However-”

“You hid some of the details?” Linn interjects, causing Twilight’s ears to fold against her head.

“Y-you already knew, huh?”

The pink-haired terrarian shrugs her shoulders, “It was obvious from the day you told me and my aunt about it back in the throne room. But we needn’t worry. If Terra trusts this Yog character, then I do as well.”

“But how can we be so sure?” Rainbow Dash responds.

“It’s simple,” Shadow Thunder answers. “Didn’t you know? Terra is an Outer God as well. I’m pretty sure she’d know if another one of her kind isn’t trustworthy.”

“WHAAAT?!” Rainbow Dash, Applejack, and Rarity exclaim in unison. All while the rest of the nearby group comes to join them.

“Our grandmare actually mentioned these Outer God entities before the unification of our worlds,” Celestia comments as she trots towards them, having overheard the conversation with the rest of her party just behind the alicorn. “Just what kind of power are we facing here?”

“These are things you’ll have to talk about in the future,” The Doll responds. “But for now, the time for talk is over. I know there are a lot of questions, but we’re in the middle of an invasion. We must make haste.”

“Fucking, finally!” Both Arche and Venomous Sting shout in unison.

“All this talking is annoying me, hurry up and throw that thing into the lava so I can go fight some demons,” Venomous said.

“There’s no need to be such a brute about it, you ruffian!” Rarity exclaims.

“Ohoho! Hey, let me tell ya something, Rarity.”

“What is it now? Can’t you see we’re in the middle of a very delicate situation?” She responds while rolling her eyes.

“Nightmare Rarity says: Hi.”

The fashionista’s eyes shoot wide open, “W-what…? N-no, you’re lying, that thing is gone!”

“Nay!” Luna exclaims with shocked features. “Thy foul darkness is vanquished!”

“Pffft, please. If she was truly gone, then why is she and a bunch of other GrimDarks wandering around Terraria as we speak? Not to mention those fuckers my dad and the other Ancients are fighting out in the desert. Oh, and Nightmare Moon is-”

Venomous’s words are cut off as Celebes activates the effect of her blade, Bloody Edge, calling upon the powers of the Fiery Greatsword to teleport the duo away in a spire of flames.

-TERRARIA, CAMELOT CASTLE-

The throne room is currently in shambles as two individuals stand before Fluttershy, Terraria’s own version of Tirek and Cadence, and Queen Amore. Said queen is currently in her unicorn pony form.

“So that’s how you two brought down our barrier!” Amore exclaims.

“Indeed,” Royal Advisor Neighsay responds before turning his gaze towards The Princess. “I must say, I thank you for being a most useful tool, princess.”

“T-this is all my fault…” The Princess mutters in regret.

“Hey, come on,” Tirek responds, placing a hand onto her shoulder. “Everyone screws up every now and then. Heck, I do it all the time. Look, none of us could’ve known that little pegasus was gonna sneak up on me, and hold me hostage.”

“Where did that pony go?” Fluttershy questions. “She took Excalibur with her when-”

“None of that shit matters now! Ahahahaha!” The demon that was formerly disguised as Flash Sentry exclaims maniacally, floating in place with its legs crossed.

“We’ve won! Ahahahaha! All of the world is fucked, and my demon cock is going to plow each and every last one of you slutty sluts!” The demon turns its gaze towards Fluttershy, licking its lips, “Ohohohoho, you’re a virgin… your cherry will be fun to pop!”

“Now, now, Samael,” Neighsay responds. “We mustn’t be so forward with our intentions. It takes away the fear factor if you tell them what you’re going to do.”

“Fuck that shit! Also, why are you still wearing that disguise, Infernon?!”

“I-Infernon?!” Amore exclaims in shock, causing Cadence, Fluttershy, and Tirek to turn towards her.

“Who is that, mother?” The Princess questions.

“One of the most powerful demon lords in The Underworld,” Amore answers, shaking her head in disbelief. “But this shouldn’t be possible, Daedalus killed you!”

“Mmmm, yes. But you see, I was spared thanks to Lord Lucifer’s powers. And now that Daedalus isn’t here to save any of you, this world now belongs to The Underworld. As it always should’ve been.”

Fluttershy spreads her wings in defiance, “If you think we’re just going to stand here and let you do that, you’re wrong!”

“Haha! I like you!” Samael exclaims happily, stretching his legs in amusement. “I hope you keep that fighting spirit while I’m fucking you senselessly!”

Suddenly, a popping sound emits from behind Samael, followed by pink clouds and an eagle’s talon that taps the demon’s shoulders. Everyone turns towards the newly arrived serpentine entity whose eyes began to flash crimson red, accompanied by heavy breathing as smoke escapes his nostrils.

Fluttershy was absolutely stunned to see an all too familiar presence, and recovers from her stupor before shouting:

“Discord! You’re here!”

“Wait… isn’t that, Disidian?” Amore questions with wide eyes.

“The Lord of Chaos…” Cadence comments.

“Hey, why do I feel like I met him before?” Tirek inquires.

“What... did you just... say…?” The draconequus asks seethingly, his talon tightening on Samael’s form.

The demon smirks, “Oh, you heard me. But in case you didn’t… I’M GOING TO FUCK THAT PONY’S LIGHTS OUT WITH MY-”

Discord shoves his face into the demon’s, cutting off their words, “Let’s take this OUTSIDE!”

The draconequus raises his lion’s paw and snaps it, disappearing in a cloud of chocolate milk mix. However, he didn’t take notice of the yellow blur that got wisped away along with him and Samael.

“Hmmm, well, that was interesting,” Infernon comments, looking over his right shoulder to where Samael, Discord, and Fluttershy once stood. “She was certainly a fast one. But she’s lucky...” The Advisor turns back to those who are left in the damaged throne room. “Because she just spared herself from what I’ll do to you three.”

“Cadence, Tirek, you two must escape before-”

“No!” The Princess interjects. “I’m not leaving your side, mother,” She conjures forth a very particular bow from her inventory.

“I’m done running away… when father died by Yharim’s hands, you told me to run… so I did.”

“Sweetie, I-”

“I’m not angry with you, mother,” The Princess interjects. “You were only doing what a mother normally should do, and protected me. No, I’m angry at myself…” She closes her eyes and tightens her grasp upon the bow, “I was bestowed Daedalus’s Stormbow, and yet I still ran away instead of fighting. I blamed myself for Dad’s death after all this time...”

The Princess opens her eyes, forms a face of absolute determination, and takes aim, “But not this time! By this bow that was once wielded by Daedalus himself, I will fight!”

A warm aura surrounds the bow, “Back in Yharim’s Kingdom, I watched as a dark pink pony fought against Cosmos, the Kitsune Tyrant. She was up against a being that existed for untold millennia, yet she still stood up to her.”

“Is there a point to this tale, girl?” Infernon questions in annoyance. “Are you telling me your obituary?”

“Hey, buddy!” Tirek shouts. “Shut it! Let The Princess speak!”

“Or else wha- wait a minute…” The disguised demon narrows his eyes, “You seem familiar.”

“I don’t know what you’re talking about, unless I accidentally stole magic from you once before. In which case, considering current events, I’m NOT sorry.”

-This terrarian… there’s something different about him, yet also familiar…- Infernon states internally. However, he’s drawn out of his inner thoughts as a series of arrows rains down from the heavens.

‘Neighsay’ dodges in response to the arrows, but a pink aura surrounds the projectiles which causes them to home in onto the disguised demon.

“What is this?!”

“Actually, there was indeed a purpose for that tale,” The Princess comments with a smirk. “You see, this bow is powered by acts of bravery. And that pony’s actions gave this baby a whole lot of juice!”

An endless barrage of arrows covered in holy auroras begins to rain down upon Infernon, while he also tries to dodge the pink arrows that gave chase. However, The Princess wasn’t done yet as she sends away her bow and conjures forth a very familiar Staff of Necrosteocytes.

“Words can’t express how proud I am of you, daughter,” Amore comments, her pony form ever-present. She takes notice of the staff, “Wait, how did you get that?”

“Yet another gift from my time in the Jungle tyrant’s former domain, and while the staff itself might not help us,” She raises it high above her head. “It’s the beings trapped inside who can give us a helping hand!”

The Princess brings down the staff with all her might, shattering it against the marbled floor.

“Hey hey, isn’t that the same staff with that alien and- oh…” Tirek realizes as his eyes widen.

“Wait, alien?” Amore questions with a side glance.

Tirek scratches the back of his head nervously, “Just, uh, don’t go attacking the other guy that comes out.”

Amore’s gaze was still etched with confusion, but her answer would come very momentarily as, during their conversation, a grey aura escapes from the now shattered remains of the Staff of Necrosteocytes. Bones begin to manifest from within the grey mist before they fused together; followed by an all too familiar skeletal entity covered by a symbiote.

“At long last, we have escaped from that prison.”
“Yeah… it only took her royal highness so long…”

Amore becomes absolutely shocked by the presence of the large skull as its two arms begin to manifest moments after.

“T-that’s… Skeletron?!”

Yog's art is created by: https://www.deviantart.com/skyeypony

Character inventory/equipment:

Fluttershy: Statigel Armor(pony, equipped), Overloaded Blaster, Eviscerator, Crimslime Staff, Corroslime Staff, Slime Staff, Finch Staff, Snow Flinx Staff, Hornet Staff, Blood Clot Staff, Deathbringer Pickaxe, Blood Lust Cluster Axe, Healing Potion, Honey Comb(equipped), Brain Of Confusion(equipped), Mana Polarizer(equipped), Honeyed Goggles, Slime Mount, Staff Of Necrosteocytes, Purified Jam.

Rainbow Dash: Necro Armor(pony, equipped), Star Cannon, Minishark, Eviscerator, Aquatic Discharge, Bloody Rupture, Deathbringer Pickaxe, Blood Lust Cluster Axe, Healing Potion, Aero Stone(equipped), Brain Of Confusion(equipped), Bone Glove(equipped), Mana Polarizer(equipped), Victory Shard, Slime Mount.

Zecora: Crimson Armor(zebra, equipped), Dune Hopper, Sausage Maker, Beenade, Tooth Ball, Aorta, Deathbringer Pickaxe, Blood Lust Cluster Axe, Various Potions, Rocket Boots(equipped), Honey Comb(equipped), Sand Cloak(equipped), Brain Of Confusion(equipped), Bloodstained Gloves(equipped), Bone Glove(equipped), Mana Polarizer(equipped), Honeyed Goggles, Skeletron Hand.

Starlight Glimmer: Meteor Armor(pony, equipped), Space Gun, Starfury, Vein Burster, Purple Phaseblade, Deathbringer Pickaxe, Blood Lust Cluster Axe, Mana Potion, Healing Potion, Victory Shard, Rocket Boots(equipped), Aero Stone(equipped), Brain Of Confusion(equipped), Mana Polarizer(equipped), Bone Glove(equipped), Slime Mount, Book Of Skulls, Skeletron Hand.

Rarity: Meteor Armor(pony, equipped), Space Gun, Hornet Staff, Snow Flinx Staff, Ice Mirror, Blood Clot Staff, Deathbringer Pickaxe, Blood Lust Cluster Axe, Mana Potion, Angel Wings(equipped), Brain Of Confusion(equipped), Mana Polarizer(equipped), Slime Mount, Book Of Skulls, Skeletron Hand, Staff Of Necrosteocytes.

Applejack: Crimson Armor(pony, equipped), Vein Burster, Orange Phaseblade, Deathbringer Pickaxe, Blood Lust Cluster Axe, Rope, Metal Detector, Healing Potion, Angel Wings(equipped), Honey Comb(equipped), Flurry Boots(equipped), Brain Of Confusion(equipped), Mana Polarizer(equipped), Honeyed Goggles, Slime Mount, Bone Glove, Skeletron Hand.

Twilight Sparkle: Meteorite Armor(pony, equipped), Space Gun, Book Of Skulls, Deathbringer Pickaxe, Blood Lust Cluster Axe, Mana Potion, Ichor, Victory Shards, Aero Stone(equipped), Brain Of Confusion(equipped), Mana Polarizer(equipped), Slime Mount.

Pinkie Pie: Crimson Armor(pony, equipped), Vein Burster, Blue Phaseblade, Bloody Rupture x2, Aorta, Deathbringer Pickaxe, Blood Lust Cluster Axe, Metal Detector, Angel Wings(equipped), Honey Comb(equipped), Flurry Boots(equipped), Brain Of Confusion(equipped), Mana Polarizer(equipped), Bone Glove(equipped), Honeyed Goggles, Slime Mount, The Blood Butcherer, Skeletron Hand.