Sorry beforehand, guys. The format for this one is a little bit different since I wrote it in my phone.

Hope you still like it though, enjoy :)

We're standing on the edge of a small wooden bridge in front of Willy's house. The bridge leads straight to the deep part of the lake.

'What are we going to do?' I ask.

Yukimura turns back to me, 'We're going for a swim.' He grins to me.
Marcus grabs my hand, and then he draws something on my right palm with a marker. Some sort of a symbol.
He's about to do the same to Lisa, but then Lisa brushes Marcus' hand off.
Lisa glares at Marcus, trying to keep him away from her.

'You're going to need this.' Marcus says.
Even though it's only a simple sentence, Marcus makes it sound so believable. It's like anything he says, people would believe him. Lisa is no exception; she offers her hand to Marcus even though she doesn't seem to like this one bit.
Marcus draws the same symbol that I have, on Lisa's palm.

'What is this for?' I show the symbol to Willy.

'Marcus is going to make you able to breathe in water.' Willy answers.
Before I can ask further questions, Marcus begins chanting in old Greek language, something that you only see in really old Greek relics. Marcus is casting a spell, that's pretty much new to me. Seeing a demigod casting a spell.
It feels like there's something coating my skin, but when I touch my skin, there's nothing there.
Marcus nods to us, and then he gives us way to the lake.
I approach the lake with all three sons of Poseidon watching us. I feel uneasy and a bit distrusting that we'll be able to breathe in water.
Lisa looks at them, 'I'm not jumping into the water.' She declares.
Willy sighs, he glances at Marcus. Marcus then approaches Lisa, and then he swiftly grabs her and carries her. Lisa struggles, but Marcus doesn't seem to budge. Marcus jumps into the water alongside Lisa, while Lisa is still trying desperately to break free; Willy almost smiles seeing this.
Yukimura grins, but it's not directed to Marcus and Lisa, he's grinning to the water. I can feel his longing to go to the water. He runs and then he dives into the water, disappearing completely from our sights.

'Your turn now, Annabeth.' Willy says.
I glance at him, and then I turn back to the water.
I close my eyes, and then I take one step forward. I fall to the water, and completely submerging myself. I still hold my breath, and still closing my eyes. Slowly, I try to breathe, and it works. I can feel the air getting to my lungs. I start to breathe normally, and I open my eyes.
I realized that I can feel the cold refreshing water all around me, but my clothes are still dry when I touch them. It feels a lot like swimming, just that you're able to see clearly and breathe normally underwater.
The lake is as clear as daylight, with the sun piercing through the water surface, making it easier to spot everything down here.
Marcus is still carrying Lisa on his shoulder, and Lisa is still doing the same thing, trying to break free from Marcus.
Yukimura is swimming playfully. He swims really fast, doing somersaults, and a couple other tricks.
Willy splashes down next to me. He glances at me, and then looks at his brothers.
Marcus and Yukimura swims deeper into the lake. Willy follows them, and so do I.
We keep swimming deeper, until finally all lights disappear.
I keep swimming deeper but I'm swimming blind. Just when I'm about to stop, lights appear from what I assume is the lakebed.
Thousands of glistening colorful collars bright up like the Fourth of July. It lights up the way deeper into the lake. It's like watching a rainbow up close and under the water.
Schools of colorful fishes decorating the lake, they're gleaming with sim lights as well. I even recognize some of them; some are not even supposed to exist here.
A school of whale sharks right past me. We're considered as a part of the ecosystem down here by all the fishes.
I can see Marcus and Yukimura up ahead, while Willy is right behind me.

'Beautiful, isn't it?' Willy almost whispers.
I can't lie; this is amazing, even Lisa who was struggling the whole time is now quiet. She's completely taken by the view.
Is this what Percy sees and feels the whole time he's underwater? I can't help but feeling a little bit envious of him right now.
Willy swims further down below, and I follow him. We've arrived in front of a large looking cave, a huge grim looking hole serves as an entrance. Both Willy and I enter the cave. It turns out that the cave isn't that big, only the entrance is big. There's nothing but walls of rocks, and the only way left is up to a small opening. Willy signals me, and then we both swim upward. We resurface, although I'm a bit surprised that this part is not drowned in water.
Somehow, Marcus and Yukimura are already out of sight. I'm sure Lisa is safe with them, I doubt they have any intention to hurt her.
There's a small looking shore right in front of us. Willy gets out from the water and onto the shore, and so do I.
There are two lanterns hanging from the ceiling, with the fire lit on. It lights up the small shore. The shore leads to a narrow dark passage; it fits only one person at a time.

'After you, Annabeth.' Willy says.
It's strange. Any other time, I wouldn't have listened to someone that is plotting the end of the gods, but I figure that if I keep sticking with him, I might know more about what I'm dealing with.
I enter the narrow passage, and I walk slowly. The path curves to the left, and then to the right. It keeps doing that for a minute or so. From a distance, I can hear cheering, and it gets louder and louder. Finally I can see the end of the passage, alongside it is a blinding blue light. The cheering is practically next to my ears right now.
I exit the passage, and the blue light blinds me for a moment. I shield my eyes with my hand, while I move away from the light. The cheering on the other hand is as loud as it can be.
I move away to the right, and finally able to see what's going on here.
I find myself in some sort of a stadium. The stadium is shaped in an oval shape. The seats are benches like, made from dark colored coral rocks. The stadium's seats are arranged in an escalating way, and a bit close to one and the other. Shining blue rocks are placed on the ceiling to light up the stadium, somehow it gives the feelings like we're still underwater, but still clear enough to see everything. In the middle of the stadium is a field of sand. Four iron gates at each corner of the field, each is twenty feet tall. Hundreds of different underwater beings are here sitting, cheering. There are mermaids, mermen, Cyclopes, even fishes who seem to be sitting down (if that even makes sense).

'Annabeth.' Willy calls, I turn to him. 'This way.'
Willy leads the way to the stadium box, where Marcus, Lisa, and Yukimura are already there. The box is decorated with colorful reefs, jewels, and seaweed. There are five grand thrones made out of celestial bronze, with jewels shining brightly, decorating them; it's like Christmas trees but they're not gleaming with lights, and they're all decorated with expensive rocks. There's a swinging door at each side of the box. It is connected to the spectator's seats.
Yukimura sits on the far left chair, the opposite from where I enter. Marcus forces Lisa to sit at the other end, and then he takes a seat right next to her.

'What is this place?' I mutter.

'Exactly what it looks like. This is an arena.' Willy looks at me, 'Welcome to the underwater colosseum.' He says. 'Annabeth.' Willy shows me the chair right next to the middle one, the other one that Marcus is not sitting on.
I sit down, and then Willy takes the middle seat. The crowd goes even wilder; their cheers are basically roars now.
On the field, a walking dolphin enters from one of the gates. The dolphin is wearing a simple blue t-shirt that says, 'Dolphin rulez!' It actually looks cute.
The dolphin walks to the middle of the field, and it has a microphone on one of its fins. The crowd dials down.

'Mermaids, and mermen!' The dolphin announces loudly. It actually has a deep grown man voice, despite its appearance. 'Welcome back to the underwater colosseum!'
The crowd roars again, shaking the colosseum.

'First, we would like to take a moment of silent...' The crowd goes silent, 'As you all may know, Lord Matthew Frost has recently passed away...' The dolphin looks a little bit sad.

'It's a shame... Lord Matthew Frost has always been this arena's favorite, and always a beloved champion.' The dolphin turns to us, but I think it's looking more at the sons of Poseidon. 'We would like to give you all, our deepest condolences. Lord Matthew would be missed.'
Willy nods to the dolphin, and then the dolphin nods back.

'Please... Let us take a moment of absolute silent, and pray for Lord Matthew. May he join his other brothers in the afterlife.' The dolphin says.
Everybody looks down, mourning for this Matthew person.
The dolphin turns back quickly to the crowd, 'And now that it's over! Shall we begin the game!?' The crowd roars in excitement.
The dolphin turns to one of the iron gates, 'Introducing, the meanest Cyclopes in the Atlantic Ocean. The three mean beans!'
The gate opens up, and three large Cyclopes enter the field.
The name is terrible, something that you expect from a Cyclops, but they don't look nice at all. They're all around eighteen foot tall, wearing white togas. They all carry spiked clubs as their weapon. They all look exactly alike, except each of them is wearing a different color of metal leaf crown; there's brown, yellow, and green.

'Will this finally be the death match that we all have come to see?' The dolphin sounds really excited, it stirs up the crowd even more.
Lisa snorts, 'So they all cheer because they get to watch a bloodbath, while you all sitting here enjoying it safe and sound. What is it really that you lose?' Lisa sounds disgusted.
Willy chuckles, 'You're a bit mistaken, Lisa. They do get to enjoy this thing, but here, my brothers and I are never safe.'
Lisa looks a bit puzzled.

'So now then!' The announcer continues, 'Shall we decide who is going to fight these large terrifying beasts!?' The blue light suddenly focuses up on us.

'After all... We are the main entertainment.' Willy smiles wickedly to Lisa.

'So which one of these three princes of sea that shall have this honor!?' The dolphin announces loudly and excitedly.

The crowd begins chanting names. Some are chanting 'Marcus! Marcus!', some others are chanting 'William! William!', the rest are chanting 'Yukimura! Yukimura!'
Slowly enough, the name Yukimura begins to prevail. The crowd begins chanting Yukimura's name only.

'I guess it's my turn.' Yukimura grins, he seems to be enjoying this very much.
Yukimura gets off from his seat, and then he jumps off from the box to the field. He lands on his feet perfectly and the crowd goes wild.
The dolphin announces, 'Introducing the opponent for these one eyed beasts! The mighty son of Poseidon! One of the princes of the sea! Armed with gauntlets, he fights with his fists! You remember him, folks. This is the man that slew fifty elite mermen all by himself! Lord Yukimura Snow!' The crowd cheers again.

'Let the match.. Begin!' The dolphin immediately runs to one of the gates, it exits right away.

'The primordial gods do not like to waste their time. When I made a deal with them, they wanted proof that my brothers and I are able to do this. So they created this underwater colosseum, and we've been fighting here ever since.' Willy explains. 'Here we fight for our lives. Every moment here could be our last. This is why we are stronger than all of you.'

'There were nine of us, at the beginning.' Marcus mutters. 'Sebastian, Cassandra, and Cornelius didn't make it.' He turns to Lisa, 'We did risk everything... And we have already lost so much...' Marcus has a painful expression on his face.
The crowd is roaring Yukimura's name, and the Cyclopes roar back at the audience.
The Cyclopes approach, and are trying to surround Yukimura. Even I can see that this is bad.

'Shouldn't you help him!?' I ask Willy frantically. I know that Yukimura isn't exactly an ally, but he's still a demigod.

Willy looks calm, 'I can't.'

'What do you mean you can't!? He's your brother!' I yell.
Willy sighs, 'Even if I want to, I'm not allowed to help him. The elder gods forbid it, we are not allowed to interfere with his match. Besides...' Willy turns to me, 'There's no need for me to help him.'
The Cyclopes charge and then try to smash Yukimura. Yukimura dodges perfectly, and the Cyclopes' clubs smash the ground instead. The clubs barely miss him.
The crowd goes nuts again.

'You're going to let him die!?' Lisa yells. I guess even she doesn't want to see Yukimura gets pounded into the ground.
Yukimura's casual expression turns into something else, now he's stone cold hard. His aura and that relaxing feeling around him are gone. All of the sudden, he becomes a completely different person.

'Did you notice, Annabeth?' Marcus asks. 'Yukimura's personality is somewhat an interesting one. When he's in combat, he focuses on nothing else but the fight. He turns his emotions off, and he shows no mercy; he becomes a weapon. The only thing he keeps is his sense of honor.'
I'm not really that convinced but then the crowd cheers out loud. I look at the field. Yukimura just struck the leg of the Cyclops with the brown leaf crown. The Cyclops' leg is sent up flying, and the Cyclops falls down hard. Yukimura then jumps onto the Cyclops' belly, he lands and then he smashes the Cyclops' stomach with his right fist. The Cyclops disintegrate into dust.
The other two Cyclopes take a step back, they're cautious now. I think they've realized that Yukimura isn't someone that they can defeat easily.
The two Cyclopes circle Yukimura, but Yukimura stays still. The Cyclops with the yellow leaf crown takes a stand in front of Yukimura, the green one is in Yukimura's back. They both charge at the same time, wildly swinging their clubs. Yukimura runs toward the Cyclops in front of him, he dodges the club, and then slide down through the gap between the Cyclops' legs. The two Cyclopes collide with each other, and then they tumble down.
The Cyclopes are on the ground, and Yukimura didn't waste this opportunity. Yukimura jumps again, onto the head of the Cyclops with the green leaf crown. He closes in quickly to the eye, and then he strikes it down. The Cyclops with the green leaf crown bursts into dust.
The cyclops with the yellow leaf crown gets back on his feet. The Cyclops looks scared, probably because his other two friends are nothing more but dust now.
Yukimura approaches the last Cyclops, and the Cyclops is unsure of what to do. Finally, the Cyclops looks desperate enough, it charges wildly toward Yukimura. The Cyclops swings his club, in an attempt to smash Yukimura. Yukimura dodges to the side, and the club misses him. Yukimura then leap onto the back hand of the Cyclops. Yukimura runs on the Cyclops arm, toward the direction of the Cyclops' eye. The Cyclops stumbles back, scared of Yukimura. The Cyclops trips, and about to fall down on his back. Yukimura quickly leaps forward, and then he strikes they Cyclops' eye. The Cyclops disintegrate into dust, and Yukimura lands perfectly on his feet.
The crowd goes wild again, they begin chanting Yukimura's name. Yukimura raises both of his hands, stirring the crowd even more.
I notice his gauntlets, like sea in form of gauntlets. Can't believe it took me this long to notice that. It looks a lot like the dagger that John used to stab Cathy.

'His gauntlets. What are they made of?' I ask.

'Atlantis Sapphire. Currently there are only five weapons in this world that are made from that mineral.' Marcus replies, 'All of them are in our possession.'

'As for what's so special about them... I guess we'll just keep that as a surprise.' Willy grins.
I stay silent. Something here doesn't add up, listening to their stories, and watching one of them fight in a death match.

'Why are we here?' I ask.
There's a moment of silent between us.

'We wanted to show you this.' Marcus replies.

'There's something else, isn't it? I can't imagine that you bringing us here just because you wanted to prove that you all are risking something here.'

Willy turns to me, he smiles a bit. 'Very sharp, Annabeth.' Willy turns back to the field, 'We want to show you our main entertainment tonight.'
I can feel the horror behind his words, whatever he wants to show us is definitely something that we won't like. I turn back to the field, and the dolphin announcer is already in the middle of the field, next to Yukimura.
'Praise to Lord Yukimura! Once again he prevails against his opponents!' The dolphin says. The crowd cheers out loud. Yukimura raises his fists once more, and then he exits the field, into one of the iron gates.

'Now then... On to our next and last match.' Another one of the iron gates opens up.
I can see Willy smiling wickedly from the corner of his lips.
The dolphin announces, 'He was born more than fifty years ago. This particular demigod has been quite famous for his ability to sneak around. He is able to call upon the spirits of the dead, and able to travel instantly to anywhere. Have I mention that he is also royalty? Currently the only child and heir to the underworld!'
Oh gods... It can't be.

'Presenting! Nico di Angelo!'
And then there he is, Nico di Angelo, entering from the opened iron gate. I gasp in horror, he looks a little beaten up, but other than that he looks fine. Still, standing there in the middle of the field in this colloseum can't be good.

'Now then...' The dolphin turns back to the sons of Poseidon, 'Shall we decide who's going to face him!?' The dolphin announces grimly.