Son Of Chaos Book two: Underworld Secrets.

Written by Kevin1984

Disclaimer: I do not own Percy Jackson.

A/N: Warning spoiler in this chapter for the future series.

Chaos' Domain

Chaos watched as his son continued training, he was in the middle of sparing with his girlfriend. Chaos was surprised at how quickly Thalia recovered, but in the end he put it down to Percy. When Chaos had explained to Percy that he was going to begin training to unlock the rest of his powers, he was surprised to hear that Thalia wanted to join in. The two had been training for almost a year now, and it would soon be time for them both to return back to their world. Percy could now manipulate time. Chaos thought this would be the perfect gift, especially when he faced Kronos. The King of the Titans would be in for a nasty surprise when he faced Percy. Chaos had also provided Thalia with a new weapon. Instead of her spear producing lightning, it now could produce his essence, just like Percy's sword could. This would allow her to kill Gods and immortals, just as Percy could. While watching his Son train, he had also been keeping an eye on things happening in earths dimension. It seems Thalia tree was getting worse, and soon the barrier would be down unless someone did something about it. Chaos had already asked Percy if he was planning to go rescue the fleece again. However Percy had decided that he would sit this quest out and allow Mark to make a complete fool of himself. Unknown to Chaos, one God would need Percy's help more then ever.

Underworld

Hades, stood looking over the underworld, he was in deep thought regarding his Children safety. He had heard what happened in the last time line from Percy, and he wanted to make sure he avoided another daughter losing her life to early. Hades suddenly glowed and found himself as his Roman Counterpart Pluto. You see the Gods had a big secret, apart from their Greek forms, they also had a Roman form. The reason Hades had suddenly switched form was because he was thinking about his daughter Hazel, she was his only Roman demigod, and she had died way before her time. Hades then glowed again before switching back to Hades as he thought about Nico and Bianca. He found himself getting one major headache, from switching forms. He now remembered why he avoided it. Hades decided that he would still continue the plan of having one of his furies collect Nico and Bianca from the casino, then have them transferred to a boarding school. Hades was pleased that Percy had already introduced himself to his two children. This meant when he suddenly appeared to rescue them next year then they wouldn't be as surprised as they were before. Percy had also promised him that he was going to make sure Bianca did not join the hunters this time, preventing her from dying to early just like Hazel had all those years ago. Hades growled as again he started to switch forms. He paced around his study. He knew Hazel's Power could be useful. You see Just has Hades had a different form, Pluto also had a different power to his Greek counterpart. Pluto had the power over all metals, this meant he could render any armour or weapon useless. A skill he knew Percy would find useful in the future. However, the problem was Hazel's soul had been claimed by death and instead of it going to the Elysium Fields like it should have, it ended up in the Asphodel Fields to ensure her mother did not wind up in the Fields of Punishment. Pluto knew he was forbidden from taking her soul from death, so he decided to enroll Percy in helping him rescue her. Now though the only problem was convincing the Son of Chaos. As Pluto he didn't have that much interaction with Greeks especially demigods. So how would he convince Percy to help him.

Meriwether College Prep

Mark was walking around with his new friend Tyson. He was still trying to work out why Grover had been contacting him, through their weird link. According to the Satyr he had been on the hunt for the God of the wild Pan. And some how ended captured, and now he was being held on some island. He was pulled from his thoughts by a group of bullies making their way towards him. He noticed his friend Tyson immediately stepped in front of him for protection.

Tyson towered over many of the students and was considered some type of freak. He had been homeless only a few months ago. He had made his home in an alley not far from Mark's school. He didn't like being all alone at night, not to mention he was always cold and hungry. It was by poor chance that one of Mark's school teachers found him. She decided that she would use him as a sort of study for her class. Tyson didn't mind being used as a teaching project as long as he got a warm bed and food, he was more then happy for the kids to stare and study him. However Mark had felt sorry for the way the school had treated him, and asked his mother if they could look after him. Tyson had been thrilled when he had heard that Mark's mum had said yes. The two have been best buddies ever since. Due to his size and built Tyson normally scared anyone away, who wanted to attack Mark, however these bullies were different, they didn't seem that intimidated by him, and just carried on walking towards him.

"Oy Freak, get lost. It's Mark Jackson we want. Not you!"

Tyson ignored the bullies and prepared himself to fight. No one would hurt his friend Mark. No one.

Chaos Domain

Percy fell backwards, totally spent. He and Thalia had been sparing for several hours, they knew it wouldn't be long before they returned to camp half-blood. The crap was going to hit the fan when everyone discovered that Thalia was in fact alive. Percy was worried how Thalia would react to Annabeth, after all they had been best friends, well still were in this time-line. However, Thalia had promised him, as long as Annabeth kept her hands to herself, then she wouldn't start anything. Another thing worrying Percy was how were the camp going to react to them dating. I mean Percy had never seen Thalia, so how were they going to explain their relationship? It had been Chaos who had come up with that answer. After Luke had poisoned the tree, Thalia had been released and to keep her safe, Chaos had insisted that they bring her back to his domain. During the time here together, they had each grown closer to one another. Giving them a perfect story to tell anyone, who questioned their relationship.

"Lets call it a day lightning Angel. You completely wiped me out today."

Thalia giggled and then crawled on all fours towards Percy. "Ah is my big bad boyfriend tired after a little sparing contest. Want your little lightning Angel to make it all better?"

While they had been in Chaos domain, Percy had stopped calling her Pinecone face and now instead called her his Lightning Angel. Thalia personally thought it was a little too long, but Percy enjoyed calling her it so she couldn't see the any problem with it.

Percy opened his arms as Thalia crawled into them. If anyone was looking at the two teens now, they would assume that they were a lot older then just thirteen. Of course in theory Percy was seventeen and Thalia was sixteen, and their minds were proof of this in how they were acting. Percy kissed her gently, then wrapped his arms around her.

"How did I not see that you were attracted to me in the first time-line Thalia? I must have been really blinded by Annabeth, not too notice."

Thalia shrugged her shoulder, and just pulled Percy's arms further around her. "Don't know, but that's all in the past now, and what matters is our future, and how we are going to make everyone believe in the Gods once more, by doing our jobs right."

Percy nodded. "Have you thought anymore about Bianca joining our duo? I know it's not normal for a boy to be in love with two girls, but I can't help the way I feel about her. Seeing her in the Casino alive was just the best thing ever."

Thalia growled. "Well I have thought about it, although I am not too pleased that my boyfriend wants to be with another girls. I understand that this is you were talking about, and you do nothing normal. As long as you love us both then I can't see the problem Bianca joining us."

Percy smiled, before kissing Thalia again. However this kiss was no gentle kiss, but a kiss filled with love and passion. Percy and Thalia were about to go full make out when Chaos interrupting them.

"It's time you two."

Taxi On way to camp half-blood.

Annabeth, Mark and Tyson slammed against each other as the taxi driving them was flying around various corners and down various roads. They had just escaped from a group of Lastrygonians, who had disguised themselves as school bullies to attack Mark. It was during the fight that they finally found out that Tyson was no normal kid, but he was in fact a Cyclops. Annabeth had been very worried when she had found this out. If there was one monster Annabeth hated more then any it was Cyclopes. She had been captured by one on her way to camp the first time. It had imitated her father and best friends voice to lure her in. So to find one right next to her was a little scary. The passengers in the back smashed against each other once more as the taxi still continued on its way to camp.

"Give me the wheel, I'm the one with the eye."

unfortunately the only taxi that Annabeth could afford to hire was the one driven by the legendary grey sisters, also known as the norms. They had been the ones to reveal to the original Perseus how to defeat the Kraken. And they were always fighting over the one eye that they shared.

"No way you old bag, you just tell me which way to go. After all you have the eye."

Mark was getting fed up with all the arguing going on, up front. He was still coming to terms with finding out that his new best friend was in fact a cyclops. Mark was surprised that he had never noticed it before. He groaned again as his head banged against the roof of the car, as the taxi flew over another speed hump.

"Nearly there kids."

Mark groaned, he was sure he was bruised all over thanks to the taxi having no seat belts. He noticed Annabeth wasn't looking much better, as she too had a nasty bump on her head. The only one who seemed to be enjoying the ride was Tyson. Suddenly the taxi came to a complete halt sending all three back passengers forward.

"Camp Half-blood. There we go my dearies."

Annabeth and Tyson climbed out of the taxi, just as Mark was about to follow, one of the sister's grabbed his arms. With the other hand she placed the huge eye in front of him. "Mark Son of Poseidon, the two things you seek are hidden in the sea of Monsters. Many trial await you, have faith and courage and you will pull through."

Mark removed the sister hand from his arm, and climbed out of the taxi, the message still ringing in his ear. Soon the taxi had left. Annabeth, Mark and Tyson made their way up the huge hill. Once they got to the top, they could see just how bad Thalia tree was. Almost half of the trunk was completely black. Annabeth wondered if her best friend would be okay. However her attention was soon drawn to the horn sounding and a dozen demigods all appeared around them weapons ready. It was then she realised the camps alarm system must have activated due to Tyson entering the camp with them. Annabeth saw Chiron push his way to the front. She noticed the shock on his face when he looked at Tyson.

"Annabeth what is the meaning of this? You of all people should know Cyclopes are dangerous, why have you brought one into camp?"

before Annabeth could explain Mark decided to cut in. "Sorry sir, it's my fault. You see Tyson attended my school, however the mist obviously hid what he really was. We were attacked by a group of giants who were throwing metal balls of fire at us. If it hadn't been for Tyson protecting us both, then we would most likely be tied to a spit and being roasted over an open fire."

Chiron lowed his head. "I see. Well Mark as he is your friend then you will be responsible for him. However make no mistake the first sign of trouble, and he will be killed. Is that understood?"

Mark lowered his head and nodded. "Yes sir."

Chiron nodded. "Good now I want you and Annabeth to give me a full report on what took place today. But first go get settled in. By the way have either of you heard from Percy? He hasn't been heard or seen since the end of last summer."

Annabeth was just about to speak, when a purple Vortex opened up, Annabeth was shocked to see Percy but even more surprised who was hanging off his arm. In fact all the demigods were now stunned. There holding his hand and leaning towards him, was her best friend Thalia.

"Thailia is that you? What happened? We thought you were still stuck in the tree."

Percy could see Thalia was not too pleased to see her best friend, so he gently whispered some encouraging words into her ears. However his warm breath seemed to making her giggle more the anything else. It was then Percy noticed several campers immediately snapped out of their stunned state and raised their weapons to point at Percy.

"You're not welcome here Spawn of Chaos. You killed our father and now we want your blood."

Percy noticed the girl was dressed in full armour, flowing red hair cascaded down her back. Percy grinned he hadn't seen Clarisse yet. In the first time line he had broken her spear, but he guessed that Mark must have done it this time.

Percy growled."Had I not killed you father, then Olympus would be at war by now. Or were you not told that it was your dim whited father who was helping Luke steal Zeus and Hades symbols of power.?"

Percy noticed Annabeth and Chiron lowered their heads before shaking them. This caused Percy to smile. "Oh well seeing Annabeth's reaction and Chiron's then I guess you didn't hear about our last quest."

Many of the demigods were now looking from Annabeth and Chiron. It was clear that both was hiding something. However their attentions turned back to Percy has he spoke again.

"Luke was the one who stole both symbols of power, when you all visited Olympus on the last winter Solaris. However before he could get a way he was caught by Ares, who wanted to turn him over to Zeus. So Luke decided to play on Ares biggest weakness. His thirst for war. He convinced Ares that if he stole both Zeus bolt and Hades helmet, and blamed it on Poseidon new demigod son, then war would soon follow on Olympus. Giving Ares what he had always wanted. So Ares decided to keep hold of the items until Mark was accused of stealing the bolt. Once he had been accused, then he would be sent on a quest to try prove his innocence. This is where your father fits in. he handed Mark a pack, to take down to the underworld. He said that it would help him rescue his mother. What he failed to tell Mark was that Zeus bolt was inside the pack and the plan was for Hades to kill him after accusing Mark of stealing his helmet, and for Hades to use the master bolt against his brother starting a war on Olympus. However, Ares failed in realising that he had also placed Hades helmet in the bag, and once it was returned to him, then he was happy for us all to leave. We were about to return the bolt to Olympus when Ares tried to stop us. It was then I decided to kill him. After all he had betrayed not only his own father, but the entire Olympian Council as well."

Percy paused to allow everyone to digest what he had just said. His eyes scanned to Annabeth who at that moment was avoiding everyone gaze. Percy decided to continue.

"After I had killed him, I then created a portal to transport Mark to Olympus so that he could return the bolt. I then came back here, as I finally worked out who it was that had stolen the weapons in the first place. I caught the coward trying to leave camp, so gave chase up the hill. That was when he revealed his sword which also happened to be poisoned. In a attempt to dodge the stab I moved out of the way, only to see his sword plunge into Thalia tree. Luke was so shocked with what he had done that he legged it down the hill and into the woods. It was then I noticed a faint glow coming from the tree. Once the glow had died down a girl laid before me. It was then my father turned up, to take me back to his domain, as I didn't want to go back to living with Mark. We decided that it would be best to take Thalia back with us, so at least she had time to recover. In my father domain I learnt more about my powers and how to use them. Thalia also trained with me. Eventually we noticed that we were drawing closer together and it wouldn't be long before I asked her to be my girlfriend, which I am pleased to say, she finally accepted. Now we have decided to return here for the summer, and by the looks of thinks, we were jut in time for the party."

Clarisse glared at Percy, before lowering her weapon. She and then led the rest of the campers away down the hill. None of them giving Chiron or Annabeth another looks.

Percy hissed sarcastically. "Oh did I let the cat out of the bag too soon."

A/N: There you have the first chapter for Book two. Underworld Secrets.

Big Thank you to my Beta Hyrulian Hero Akai