Author's note: Wow, I really need to update my other stories. But here I am, working on this one instead. I hit a streak. XD. It's insane.
Anyways, I am going to introduce an OC- two, actually. However, unlike I usually do, I'm not going to provide an origin story for these two. Maybe later, but not now- it could be spoilers.
Sorry if this chapter, or the events, seem a little rushed. I have so much planned out though, so updates will keep happening!

To reply to my lovely reviews- thanks guys!

Izi Wilson: YAY! Thank you so much!

hamadabrosrule (first review): Yay! Thanks for the list! That is so helpful! I've got my villains planned out though! However, I can include some of those. And of course I've read the demigod diaries- I read every Percy Jackson book I can get my hands on, including those!
Also, of course there will be action! Lots of it! Just... not at said moment?

hamadabrosrule (second review): *Takes a deep breath* I knew some people would have questions about that. There was an explanation last chapter, but that's okay if you didn't get that. Um... well... sort of. Anyways, Gogo was born apart from the Hamada family, but later, after Hiro and Tadashi were born, their dad married Gogo's mom, making them part of the same family. Gogo's mother- the one Hiro thought was their mother all along- died in a car crash with Hiro and Tadashi's dad. But yeah, Gogo is basically their step-sister. I really hope that clears that up.
Anyways, apart from that. I didn't say who Aunt Cass's godly parent was, DO NOT WORRY YOU DIDN'T MISS IT. I actually am not sure... If you have any ideas for that, drop me a comment! I'll consider all suggestions given.

To all my other readers, favorites, followers, thank you so much for reading this! Please, tell me what you think! I love getting suggestions and questions and such!

Gogo's POV

I knew something was wrong before we even reached the island. There were sounds coming from it. Clangs, shouts, growls, thousands of other sounds.

"This is wrong..." I muttered. "The island was silent last time we were here."

"There's an army brewing here," Annabeth said quietly.

"How do you know?" Tadashi asked.

"That's the sound of war preparations," Annabeth replied, her face turning to worry. "The question is who's leading them."

"You don't sound surprised."

"I've... heard reports of something going on here."

"And you didn't tell us?!"

"I didn't think..." Annabeth sighed, trailing off.

"How are we supposed to get in there then?" Hiro asked, breaking the silence. "If there's an army..."

"Look!" Tadashi said, covering Hiro's mouth.

A demigod patrol had exited the building below us. We all froze, waiting for them to pass. Soon they disappeared into the woods.

"What are we going to do?" I asked, once Tadashi uncovered Hiro's mouth.

"We'll need to scout it out," Annabeth said quietly. "If we could sneak in... Maybe even blend in, pretend to be part of the army."

"Good idea," I muttered. "We'd have to split up, probably... we'd attract less attention."

"Spying?" Hiro smiled. "Sounds fun. Let's do it."

A few minutes later, we were ready to go in. We left our gear behind- much to Tadashi and my disappointment- but it would stand out too much anyways. We kept our weapons, since we might need them. Hiro gave each of us a microchip, so that we could 'keep in touch', as he put it.

"So I'll go in first," Annabeth said quietly. "Invisible. Gogo, you go next. Hiro and Tadashi can go together."

We all nodded.

A minute later, Annabeth had put on her Yankees cap, and vanished. We waited a bit, and then I heard her voice in my microchip.

"Okay, Gogo, the patrol's coming back. Do your best to blend in."

I glanced over at Hiro and Tadashi, shrugged, then headed forwards. I saw the patrol ahead of me, and slipped into the back, following them. We reached the building that I remembered all too well. Last time we'd been here, Wasabi had to cut a hole in the door. This time it just opened for us.

Perfect.

"I'm in," I said quietly. "So far it's going okay."

"Good. Don't get yourself spotted," replied Hiro's voice.

"Common sense..." I muttered. "I know."

We had entered a hallway. Nervously, I followed the patrol, until I found a side passage. I slipped away, trying to avoid being spotted.

I followed the hallway until it reached a flight of stairs. Hesitantly, I walked down these, until I reached a door.

"There's an underground section here!" I murmured, surprised. "We didn't see this before."

"We weren't looking for it before," Hiro's voice pointed out.

"True," I sighed.

Slowly, I pushed the door open.

"Whoa..."

Beyond me was a huge room. It was full of machinery, but also open ground, and a sandy area that looked like an arena.

But that wasn't the craziest part.

The room was full of both monsters and people. Some fought in the arenas, some worked the technology, and others disappeared into a tunnel on the far side of the room. I stood in total silence, surprised by the sheer number of the troops in the army. If this was the army, we had a problem.

I started forwards, for a moment forgetting where I was. There was something... off about this place. At first I wasn't sure what it was. But as I walked, I realized that I could almost feel a pull coming from the tunnel at the other end of the room.

Well that's certainly not good...

I heard a noise behind me, and I spun, seeing a monster- a cyclops, actually- looking at me. My instincts took over. The cyclops opened its mouth, probably to shout a warning, when my quarterstaff took it in the head, smashing it back. I spun the weapon quickly, changing it to a sword, and sliced the monster's head off. It exploded into golden dust.

Just as it let out the bellow.

Thousands of eyes turned in my direction.

"KILL HER!" somebody yelled.

Oops...

I tensed, getting ready to fight. All of a sudden, a girl's voice came from somewhere above me.

"Stop!"

I turned, looking up. Catwalks stretched above us, and two girls stood on one of them. They looked younger than I was- about 16, actually. One had copper hair, and icy blue eyes. She was smiling slighly. The other had dark skin, and dark green eyes. She had black hair, that curled slightly at the tips. Her face was blank, showing no emotion.

"What's this?" the copper-haired girl said casually. To my surprise, she and the other girl leaped from the catwalk. The two of them disappeared, then reappeared a few feet away from me. Casually, the copper haired girl pulled out a knife, spinning it over her fingers in dizzying patterns. The other girl remained motionless beside her.

"Who are you?" she asked calmly, still spinning the knife.

"Why does that matter?" I replied carefully.

"Let's see. I don't recognize you," she began thoughtfully. "You just killed one of the monsters. You could be a recruit, but that's doubtful. Jelen, have you seen her before?" She turned to look at the dark skinned girl.

Jelen shook her head. "No."

"Hm," the girl turned back to me. "Therefore I conclude that you are either a spy, or somebody sent to stop me. Either way, I probably should kill you. But first, allow me to give you some options. And an introduction."

I waited, tense. This was incredibly dangerous. If I convinced her that she could trust me, maybe I could escape, and figure out what was going on. Not that it would help if I was killed now...

"I'm Leah," the girl continued. "Daughter of Poseidon. This here," she gestured at the dark skinned girl, "is Jelen, daughter of Hades. Welcome to the heart of my army. You've got two options. You can join me, or die."

"Those are pretty lousy options," I commented, heart racing.

"Only dying," Leah smirked. "Join my army, and I can promise you, well, everything. Renounce your allegiance to that stupid camp, and work with me instead. I can promise the rewards are greater."

I took a deep breath, then smiled slightly. "Alright."

Leah's smirk deepened. "You're joining me?"

So I can spy on you, yes.

I nodded with a shrug. "I've hardly been in that camp at all anyways. I'm not here to stop you. I'm here of my own choice."

"That's good," Leah said lightly. "I'm your new commander then. What's your name?"

She's in charge of this entire army? I didn't have time to dwell on it though.

I thought about the question.

"Ash," I said after a minute.

"Alright Ash," Leah shrugged. "You'll join my fighters. Dakota!"

A boy stepped forward nervously. "Yes general?"

"Show Ash the ropes," Leah said calmly.

"Of course," he nodded, glancing at me. "Come on."

I turned, following him, letting out a nervous breath.

Leah nodded, dismissing the rest of the monsters and people alike. I could feel her eyes on me as I walked away.

What am I getting myself into?

Leah's POV

Leah laughed, watching Ash walk away. "She's an idiot."

"Hardly," Jelen shrugged. "She isn't that bad of a liar."

"Unless you're me," Leah sighed. "She's one of them, I know it."

"Why didn't you kill her?" Jelen asked.

Leah shrugged, frowning slightly. "I'm curious, Jelen. I want to know what she's going to do, and how she goes about it. I want to know her weaknesses. Then I'll see if I can turn her."

Jelen nodded. "Very well."

Leah sighed, clenching her fists slightly. Sometimes, when she was feeling stranger, she could almost swear that her powers, the thing that made her strong, were hurting her.

Were you really meant to be like this, Leah? A soft voice said in her mind. Leah pushed it away, but it remained. You are the most powerful demigod alive. Why would you do this? Why are you not helping the other demigods, instead of doing this?

"I am helping them," Leah hissed. "The gods did this to me. I'm making sure they can't do this to anybody else."

Jelen said nothing. She was used to Leah speaking to herself.

"The gods cursed me," Leah continued. "Jelen, because of them I don't control water. Instead, this!"

The ground around her froze.

"Ice instead of water," Leah continued, hatred boiling in her heart. "I'm cold, Jelen."

Jelen was silent.

"Enough," Leah snapped suddenly. "Jelen, keep watch. If more demigods arrive, tell me."

"Of course."

"Now get away from me," Leah said quietly.

Jelen nodded slightly, retreating.

Leah sighed, shaking her head, looking where Ash had gone. None of you know what I'm trying to do for you. Fools.