To make a Long story short, I kinda lost my passion but here it is.
Italics are thoughts.
Zeus POV
Who does he think he is, defying ME, the King Of Olympus. I will put his head on a stick and keep it as a reminder for anyone foolish enough to cross me again if it is the last thing I do and who does that traitorous bitch think she is, taking his side, she will also get her punishment soon enough. Set on getting his revenge, Zeus decided, this threat to Olympus must be eliminated at once, which is why he has to do something he has not done in quite some time. Choosing the least evil in his mind, he went to one place he knew he could gain reinforcements and maybe the power he needs to get rid of the thorn in his spine.
Timeskip To Underworld In Hades throne room, Zeus POV
"It has been quite some time since we last talked, has it not brother" Zeus knew he would have to placate his brother somehow if he was hoping to get anything out of this, "Yes it has you sorry excuse of a king" replied Hades, at that moment, Zeus wanted nothing more than to show his brother who he considered weak the order of the food chain in this world. If he had any hope of reinforcement from his brother, then he had to remain calm. For now. Little did he know Hades already knew what was going on due to the shadows from structures in Olympus. He was able to watch the whole ordeal of the foolish Olympians getting their ass kicked from a safe distance, far away from that monstrosity. Hades was no fool. By a long shot. Whoever that man was, he did not want to make an enemy out of him. That is why there was no chance in hell, yea I know) he would help Zeus deliberately dig his own grave. "What brings you here Brother" spat Hades with a voice full of disgust. Zeus knew this could turn south very fast. He decided to stop wasting time with greetings and get to the point. "I know we have our differences, but there is a threat to Olympus. That could bring an end to the world before our very eyes," said Zeus. Hades saw through this facade from the start. Deciding it would be best to stop wasting time, Hades spoke. Ending any illusion that Zeus had of hope, "I will not assist you in the downfall of Olympus because of your giant ego, that man has not shown any sign of hostility or danger to anyone except the ones that attacked him first" A look of pure rage came to existence that Zeus could no longer keep subdued. Somehow managing to keep the look of hostility on his face, Zeus spoke. "well then consider yourself permanently exiled. Without wasting another breath, Zeus flashed out with two enemies of Olympus on his execution list.
Hades POV
Why must my brother be such an idiot? Hades dearly cared for all of his close family members, but even then, he would not climb aboard a sinking ship which is why he had to act fast before he suffered his brother's ignorant wrath. Deciding it would be useful to have a powerful being on his side, even though he had no idea what that man's agenda is. He understood that somehow, finding that man before Zeus does was of utmost importance. Without realizing it, Hades saved the future peace and prosperity of Olympus with a single decision. How am I supposed to find some mysterious man that I have no inkling about his whereabouts? He was no man to give up easily, so he started formulating the most efficient plan to find a man he never met.
Timeskip to Percy's mansion, Hades POV
I finally found him after hours of orders to every occupant of the underworld that could travel above. Twas no easy task finding a man that does not want to be found, but somehow a group of hellhounds spotted a large structure size shadow in the middle of the Sahara desert. I have no recollection of any mythical beings being all the way out here. The only problem is that after inputting Sahara desert, he was alone with his sense of direction. Realizing there was a quicker way instead of taking a hike and hoping to stumble upon the mysterious shadow, Hades rose to the air and spread his arms far and wide. BOOM, Was the sound that followed his hands coming together followed by a cloud of darkness. This was unexpected to Hades since he did not activate his powers of darkness, which means that he found what he was looking for. What he did not expect was a loud, dominant voice to fill every crevice of his divine body.