A/N: I've been thinking about this for a long time and I'm super excited to finally get it down on paper(screen? whatever). Consider all of my other stories on hold for the time being. It's so hard to update regularly but thank the gods for holidays. So this basically starts in an alternate reality/timeline where Kronos wins the war. Read on and tell me what you think of it.
Edit: This chapter was reuploaded since I had to make a few changes.

Somewhere underneath Rome

The dark underground palace had been Percy's constant hideout for the past two years. It was Hades', or rather, Pluto's idea. A place far away from Olympus and hidden away from the eyesight of almost all immortals. It was rather cramped, but at least this way, Kronos could not find them. Only 5 major gods had survived Kronos's attack - Poseidon, Hades, Artemis, Demeter and Hestia. They fled to Rome with Percy and a handful of other demigods, swearing to come back to revenge their home. But since then, Kronos had only become more powerful. He had assumed complete control of Olympus and all its affiliated Gods. Manhattan was a complete mess - mortals were killed regularly without any rhyme or reason. The remaining Olympians had been given a choice - swear loyalty to Kronos or be sentenced to an eternity in Tartarus. Only Dionysus and Ares had sided with the Titan lord.
Zeus wasn't given a choice. He was cut into pieces and rumoured to have faded.

'What's the matter, Perseus?' Hestia sat down beside him with her back to the wall. A few torches burned above their heads, giving some much needed warmth and light to the place.

'I just…' Percy shook his head. The truth was - he was tired of waiting. Tired of hiding in the shadows while Kronos laid waste to his homeland. It was wearing him out mentally. The gods had constructed a comfortable place under the ground, but it just seemed like a gilded cage.

Flashback (Throne room of the gods, The Last Olympian)

'Luke,' Annabeth pleaded, giving him her knife,' Family Luke, remember? You promised.'

Luke took the knife with tears brimming in his eyes. It was cruel, Kronos could only be vanquished if he killed himself. He had to make a choice.

'A single choice shall end his days,

For Olympus to preserve or raze.'

He was the hero. He was the one prophesied to die, the son of Hermes realised. There was no stopping that, nothing which could prevent it from happening. His eyes suddenly flashed gold for a second, Kronos was struggling to break through. There was not much time left for him. He had to make a choice, now.

He looked at Annabeth's pleading eyes, and all of a sudden it was crystal clear what he had to do. The Olympians deserved to suffer for what they did to their children. They must pay for their crimes.

With that thought in mind, he plunged the dagger straight into Annabeth's heart. She screamed, it was the most painful sound he had ever heard. But what hurt him the most was the look in her eyes as she died. He felt as if he was a monster. And that very moment of anguish in Luke's heart was just enough for Kronos to finally break through. A blinding light burst out from where Luke had been. The time had come. His host's body slowly crumbled into dust as Kronos regained his true form. Very soon, the world would feel his wrath.

Luke had a slight smile on his face as he died. He could finally be together with Annabeth in the underworld, just as it was meant to be, and Olympus would finally get what it deserved.

End of flashback
Percy remembered being flung back through Olympus's walls as the gods entered the throne room and Kronos unleashed a burst of power. He couldn't get the image of Annabeth's blood soaked shirt out of his mind. She would be avenged, he mentally made an oath to himself. And now here he was, doing nothing.

'You can talk to me.' Insisted Hestia, breaking him from his thoughts.

'I'm… I can't take this anymore.'

Somehow, Hestia knew what he was talking about.
'Don't lose hope.' She warned, 'Its the only thing that can't be taken away from you.'

'I wish I could.' Said Percy, 'But look at all we did. Nothing's working.'

Hestia simply put an arm around his shoulders. It worked better than any words she could have said.

On the other side of the room, Poseidon and Hades were arguing.

'We got all of them, but it still doesn't seem to work. I'm telling you, we can't trust her!' Said Hades.

'Maybe we just have to wait, if it- ' Poseidon tried to reason.

'We have been waiting!' Hades cut in, 'It's been months-'

'Boys!' Artemis shouted and both of them suddenly became silent. Artemis rarely lost her temper but right now she looked furious.

'If you think your arguing is going to help things right now, then you better shut the Hades up!'

Hades' eyebrow slightly twitched at the use of his name but he didn't object.

'I think we should just wait for Hecate.' Artemis continued. Hecate had joined their cause a few months ago and her help had proved to be indispensable. But it was hard to be sure if she was on their side.

'Right you are, Artemis.' Hecate suddenly appeared in the middle of the room. 'Pity you broke up the argument though, I was quite enjoying it. Especially what I heard about me.'

'How long have been here?' Asked Poseidon, warily.

'Long enough.' Was the cryptic reply. 'But enough of small talk. Look - I know you don't completely trust me and I don't blame you for it. But I have some bad news.'

'What?' Hades ventured to ask.

'I think you should call Percy over here. This concerns him.'

Percy came as soon as he was called.

'What's the matter?' Percy asked, looking searchingly at their faces, 'Did something happen?'

'Yes.' Said Hecate seriously, 'Our Plan won't work.'

'The response was that of utter disbelief. It was The Plan she was talking about. It was the reason all the gods hadn't rushed back to Olympus and challenged Kronos for the throne. They knew they would lose - so in the one night the gods had to make up their minds whether to join Kronos or not, they went to Athena for help. She was the one who laid the foundations of the plan. With Apollo's help, which ultimately cost him his very life and essence, the five gods were able to escape. The Plan was daring and foolish and utterly impractical, but it was the only way they could have even the slightest chance of defeating Kronos. They took a few demigods along with them, but Percy was the only one to last this long. The others had either lost hope or died in the initial months.

The Plan hinged on the fact that the only way for things to go back as they should be was to ensure something like this never happened in the first place. Crazy, right? But it wasn't completely impossible. All the minor time related gods had been brought together to try and send one person back in time to correct all the wrongs that had been done. There was the god of history, the god of past wars and several other minor time gods who were all almost completely crazy. Time as a domain was pretty hard to manage. There was even a god of clocks, who claimed to have been a mortal before he met a drunk Dionysus. Minor gods were little more than immortals with a few powers, something which was well within the ability of a powerful god to create. Athena's plan was to use their combined power to send someone back in time.

Till now they had only managed to send a small pebble about an hour back in time, with Hecate's intervention. She seemed to be pretty good with the time thing.

But now she was saying the Plan wouldn't work!

'What?!' Shot out Artemis.

Hecate turned to her.

'Time is a fickle thing, my goddess. It does not take kindly to being manipulated to the whims of another. After looking extensively for other ways, I have come to only one conclusion.'

She paused to take a breathe, and looked about her nervously. She knew what she was about to say would only make them distrust her even more. But she had to say it.

'We cannot manipulate time. Only Kronos can do it.'

The room burst into anger, shouting and disbelief. Mayhem reigned.

Shivers travelled down Hecate's back. She wasn't done yet. There was one more thing she had to say. It was the only thing which would stop their fury.

'I know how to get him to do it.'

Deafening silence followed. But now she had the gods full attention.

Olympus(One day later)

'My lord.' A demigod crept in front of Kronos, almost tripping over his own feet in the process. He visibly trembled.

'Did I not say I was not to be disturbed this morning!' Kronos rose up to his feet, scaring the several Nymphs and Dryads waiting on him beside his throne. He radiated anger.

The demigod stumbled a few steps and landed on his back. He hastily got back up to his feet and bowed deeply.

'Forgive me, lord. But… but there is someone to see you.'

'Then send them away! It cannot be important enough to disturb my morning rest!'

'She… she said she knew about the escaped Olympians.'

The demigod dared to look up from the ground but was blasted with burst of power from Kronos and instantly vaporised into thin air.

'That feels better.' Kronos muttered to himself.

'Open the gates!' He shouted to whichever unlucky demigod had been assigned to gate duty that day.

He waited for a while but didn't feel the gates opening. His anger suddenly came back. Who was that pesky demigod who dared to be asleep on guard duty?! A wisp of smoke coming up from the ground reminded him said demigod was currently indisposed.

His anger lessened a bit but didn't abate. Where were demigods when you needed them?

With a sigh of annoyance he willed the doors to open in front of him.

Somebody walked in slowly. It was Hecate.

'My lord.' Hecate came forward and bowed in front of him.

'Speak, minor goddess. But I warn you, it better be worth my time.'

A smirk came onto Hecate's face.

'I assure you, my lord, it is. I have done more than you asked. You will have nothing to complain about.'

Hecate confidently drew closer. Her midnight black hair swept in front of her shoulders as she leaned forward theatrically.

'They are coming.' She said.

'The Olympians?' Kronos asked with a slightly impressed tone.

'That I am not at liberty to say.' Said Hecate, but her smile gave it all away. Kronos's expression slowly changed to mirror hers, but with a slightly more evil look in his eyes.

Sometimes the Styx wasn't as effective as everybody thought, if you weren't careful enough.

Olympus(3 hours later)

Kronos sat high and mighty on his gold throne, the only one now occupying the throne room of the gods. He had satisfied smirk on his face. The day was finally coming, he told himself, when his control would become absolute and unopposed. The Golden Age was finally here. He shouted orders left and right, throwing Olympus into a frenzy of preparation for warfare. He knew the war would be short, but that would not make the victory any less sweeter, and he was determined to make it as torturous as possible for the Olympians.

'Krios!' He shouted to his now resurrected fellow titan who stood beside him in a sliver plated armour and with wicked looking spear in his hand.

'Yes, milord?'

'Open the Doors of Death in Tartarus and unleash its monsters.'

Krios took a moment to process what had just been said.

'Tartarus? Are… are you sure, milord?'

Opening Tartarus was something too risky even for Kronos. The monsters would be impossible to control. There would be complete chaos and no one would be there to handle it.

'Did I not just tell you to do so?' Kronos shot back in a deep voice with a hint of steel in it. His golden eyes bored into Krios.

'Of… of course.'

Krios only tilted his head, deciding not to bow. It was best to make it clear he did not approve of Kronos's decision.

Kronos threw back his head and gave a mighty shout of laughter.

'You amuse me, brother. Go now, and do what you need to. The Olympians escaped once, they will not get the chance to do it twice.'

A/N: That's all for the first chapter and I would really appreciate if you could just tell me what you thought of it till now. I'm free to any ideas and stuff and pairing's probably going to be Pertemis unless a vast majority of you people object or something else. Review!