New fanfic! Not sure what'll happen with this one, but I'll try my best! Sorry if some of the PJ characters are OOC, I haven't read the books for a super long time.

Belongs to Rick Riordan and Toby Fox.

Zeus sighed and pinched the bridge of his nose in order to stop the oncoming godly headache. After the battle against those monsters several hundred years ago, they couldn't be back. They just couldn't.

The acceptance of mortals surprised him once again. While still rather wary, they had warmed up the monsters rather quickly, and enjoyed their differences.

If only they knew their true nature, Zeus thought.

"Father?" asked a woman near his throne. He looked up and saw his daughter, Athena. "I know you are worried about the monsters, but they are not the main problem right now. What we really have to be chary of is the one who freed them."

Zeus cringed. "Yes, the mortal, if they could be called that. The human child. Not a drop of god-blood in them. To think they would be the one to receive that power."

"It is the state of mind that matters, not the body," she said, reinforcing the wisdom she represented. "As surprising as it is, their DETERMINATION surpasses that of any other being, even Gaea. No wonder the monsters want them as their ally."

She took a deep breath. "However, their resolve may be their undoing." She told her father of her idea. Zeus's eyes widened at the simplicity.

"Of course," he whispered. "It will still be difficult, but if we could harness that power for ourselves..."

"Then perhaps we could be respected as we once were, and truly rid the world of monsters," Athena finished.

Zeus stood up. "Gather the gods. We must let them know of this."

….

It was a beautiful day outside. Birds were singing… Flowers were blooming… on days like these… the members of Camp Half-Blood… were playing a game of volleyball. Specifically, six demigods from the Prophecy of Seven were playing. It was girls vs. boys.

"You spike like a girl, Jason!" Annabeth called.

"You spike too much like a guy," he yelled back as he hastily raced to hit the ball back towards her. Unfortunately, it went out of bounds.

The girls cheered. "We're tied now!"

"Nice job, Jason," Percy muttered.

"Hey, it's not my fault your girlfriend's a crazy-strong maniac!"

"What did you just say?!" Annabeth fumed.

Soon instead of volleyball, everyone had pulled out their various weapons and were taunting each other like a bunch of crazy maniacs.

This went on for about ten minutes, when everyone decided that they'd had enough and went to the big house to raid the fridge for Kool Aid. They had hoped they could just sneak in, grab the snacks, and sneak out again, but instead, a very unusual sight met their eyes.

Chiron sat in his wheelchair (not unusual), talking to a man in a mailman's uniform. He had curly brown hair and smile lines around his eyes. He had a mailbag over his one shoulder, and held a staff with two argumentative snakes on the other.

"Ah," Chiron said when he noticed them. "Hermes and I were just talking about you. Please, take a seat."

When two immortal guys, one of whom was a god, were talking about you behind your back, you knew that there was trouble.

Nevertheless, they took a seat on the ground.

Hermes looked out the window. "So, uh… I know you guys have been really busy lately, but… Have you heard about the integration of Monsters into society?"

Hazel spoke up. "You mean, monster disguising themselves as teachers so they could prey on demigods?"

"No," Hermes said. "I mean, these Monsters aren't like the ones you're thinking of." He looked to Chiron for help.

Chiron sighed and placed a hand on his head. "A few weeks ago, an enormous population of about fifteen-thousand monsters broke through a barrier keeping them underground, and decided to live on the surface." The demigods could not mask their horror. "But they aren't like the monsters you are used to. They are not disguised by mist, and are extremely talented magic users. They are of an entirely different species than the ones that prey on demigods"

"Then what's the problem?" Percy asked. "I mean, that's really weird, but if they're not dangerous, do we have to worry about them? I could do with fewer enemies."

Annabeth elbowed him. She didn't want her boyfriend to get turned into a tortoise or something for being impatient.

"I really wish we didn't have to worry about them either," Hermes agreed. "But the problem is, these monsters warred with humanity a very long time ago, because these monsters can absorb human souls."

The demigods processed this information. "What does that mean?" Piper asked.

"Well, a human soul has immense power, greater than a monster soul," Chiron explained. "If a monster were to absorb it, their power and magic levels would explode. They would become… godlike."

Hermes nodded. "It's only a matter of time before the monsters get the same idea, and attack humanity again."

"So, drive them back underground?" Jason asked.

"When the monsters were trapped, they were desperate to break the barrier by killing humans who had fallen down," Hermes replied. "If they were driven back, it would simply fuel their hatred. They need to be exterminated."

That hung over the group like a heavy fog. "Where would we find them?" Hazel enquired.

"They have set up a 'camp' in Ohio, for monsters that need a break from humanity," Chiron explained. "Only a small portion of the monsters are there, but it is a good start."

"But you can't worry about the monsters themselves now!" Hermes told them. "When the monsters left the Underground, a child helped them. They look human, but in reality, they are a demon that wishes for nothing more than the destruction of humanity. They are the one who wants to keep the monsters on the surface so that they will wipe out all humans. They are far more dangerous than the monsters are."

That was disturbing. They thought back to the eidolons that had possessed Percy and Jason in the past. The thought of facing another one was not inviting.

"Two more things," Hermes continued. But a shrill shriek broke through whatever he was going to say.

"Spider!" Annabeth screamed, pointing at a large spider on the wall. She grabbed her dagger and prepared to smash it with the flat of her blade, but it crawled out the window, and far away before she could hurt it.

She noticed everyone was staring at her, and cleared her throat. "Uh, continue, Lord Hermes."

"Uh… right. Um, first, the monsters also gained a power called RESET when they left," he said. "It allows them to go back in time to when they were in the Underground in case they get hurt. That way, they never lose any important monsters. Unfortunately, the demon that let them out is the one with control over that power."

Annabeth shivered. "So they'll use it to the advantage of the monsters?"

"Yeah, but it's annoying for them, because they have to wait until time catches up again, so they prefer not to, unless necessary. You have to bring them to Olympus, and we know a way that we can take the power from them," Hermes explained. "Don't kill them; it'll automatically reset everything."

He took a deep breath. "The second is that we have a prophecy to go with this event." He looked at his caduceus. "George, could you give us the prophecy?"

"Sure thing, boss," George replied, startling a few of the demigods. He regurgitated a small scroll, which, funnily enough, seemed perfectly dry. None of the demigods particularly wanted to touch it, but they tentatively took it anyway.

Piper unfolded it and gulped. She looked up, a little afraid. "Okay, The Prophecy of Monsters:

Six leaders of death

Friends of the foe

Should they conquer all

The world fills with woe

Beware of the verses

Poison tells truth

The Judge will guide you

As he protects youth

Choose to spare or fight

Remember what is right

Should the Angel be forced to fall

Demon's darkness devours all."

That sounded rather grim. "Six leaders of death…" Percy muttered. "Nice, sounds fun."

"Actually," Martha, Hermes' other snake, said, "we think we know what that means. Some very powerful monsters have a special type of soul, so they're called boss monsters. There are two boss monsters, but there are four other monsters that are regarded as almost equal in magical prowess. They don't literally control death; they just have the ability to cause it."

"Gee, that's a relief," Jason whispered sarcastically under his breath.

"Martha's right," Hermes agreed. "Unfortunately, we do not know who the 'judge' or 'angel' is. Even gods can only read so far into the future."

They looked at each other uncomfortably. "Well, there are six monsters; I guess we should bring six demigods. That would be us," Annabeth said finally.

"That's probably a good idea," Hermes approved. "They are very powerful, so it's not a good idea to fight more than one at a time. But you had better hurry. The longer the monsters are left to their own, the more likely they are to attack."

The demigods nodded, a little reluctantly. They had just gone on a horrible, long, and painful mission recently. They were in no hurry to start one again, even if it was for their parents.

….

As they left, Chiron dropped his tired front, and scowled. "I notice how you said inhabited, not possessed. That child is a hero to the monsters. Why are you willing to go so far just to gain a power you desire?" he demanded.

Hermes sighed. "Remember, Chiron. We were merciful to you, despite who sired you. Gods need to be respected, and this is a power a mortal cannot have. Besides, the monsters are a threat if they gain the power of the human SOUL. Do not try interfere." He disappeared after telling him this.

Chiron said nothing, and simply continued his cold glare. He wanted nothing more than his students to be safe, but he couldn't go against the gods. 'I hope the monsters have more sense than the gods do,' he silently wished. He felt as though the gods were so desperate for their respect to be restored, they would stop at nothing, even murder of an innocent mortal, to get it back. 'Whoever the judge and angel are, please protect my students.'

…

The spider hurriedly crawled out the window, after almost being stabbed. It rushed through the camp, unnoticed, and made it to the trees, where, it resolutely continued to make the trek to its destination. It was smart, so once it got to the city it hitched a ride on a bus, hiding under a seat so it wouldn't scare anyone. It traveled from bus to bus, until, at last, it reached another large city.

It continued, its resolve unwavering, never thinking of stopping until it reached its destination. Finally, it made it to a small shop painted bright purple. It slipped through the mail slot, and climbed up the wall. There, it found the person it had been looking for.

"Have a nice day!" Muffet said cheerfully, waving one of her six hands in goodbye to the customer she had just served.

The spider let a dragline down to the floor, and crawled up to reach her ear.

"Oh, hello!" she greeted. "I haven't seen you for a while! What's wrong?" she asked, blinking her five eyes in concern.

The spider whispered the disturbing things it had overheard. Muffet gulped. "Are you absolutely sure?"

The spider nodded.

She tightened one of her pigtails in nervousness. "Excuse me!" she called to all of the customers eating in her café. "I'm sorry, but this shop is closing early today! Something very important has come up!"

Some of the humans grumbled a bit about being kicked out, but left anyway. The monsters looked pretty annoyed as well. Except for one.

"Oooooooh, okay..." the ghost monster agreed gloomily. It picked up its ghost donut and prepared to leave.

"Wait! Napstablook!" she called. "You stay! I need you to go to the monster camp and deliver this message."

"I-if you're sure you want my help," he said, tears forming in the corners of his large white eyes.

She nodded solemnly. "I need you to get your cousin, and the rest of the boss monsters here. Something rather worrisome has come up." She took on a lighter tone. "Ahuhuhu! And here I thought I was going to use my magic for nothing but baking pastries for the rest of my life. This might be fun!"

Leave it to the gods to take things out of context. *Slow clap processor*

Can you guess the boss monsters? You may be surprised by some of them.