*Mount Olympus/third person*
All the Gods and goddesses gathered before the memorial, each saying their own words to pay their respects to the fallen heroes. The Gods that had helped their fellow Gods instead of joining the battle with Gaea felt the most guilt. If only they had helped Percy and Apollo face Gaea. Maybe then Annabeth wouldn't have died, maybe then Percy wouldn't have taken Zeus's lightning bolt and ended his own life. 'If only's' ruled these god's lives.
They felt extremely guilty, especially whenever the anniversary came, the anniversary of their deaths. This day was the only time Poseidon came to Mount Olympus, and each time, he looked horrible. The usual twinkle that was always in his eyes was now gone and dark circles were now always underneath them, and they got worse and worse, darker and wider around his eyes. The tan he usually sported was gone, and instead he was pale. The usual smile that he always wore was gone, and the laughter and jokes he used to eject were now replaced with frowns and he almost never talked anymore. Everytime he came to Olympus for the anniversary, he cried for hours afterward. He had gotten frailer, his cheeks had become hollow, and he was wearing clothes that were three sizes smaller than what he used to. He was so weak, he hired Hermes to transport him to Mount Olympus because he no longer could. The Gods worried he was fading away.
After the ceremony, the Gods felt a tingle in the back of their minds. This signaled that someone was about to make an oath and swear on the River Styx, they could never hear what the swear was about, just the beginning where the person stated their name then swore. The buzzing grew stronger, then stopped to let the swear through. What came next shocked them.
"I, Percy Jackson, swear on the River Styx..."
All the Gods' mouths dropped except for Poseidon's. An odd fire came into his eyes, then he disappeared. They felt his presence in Camp Half-Blood, and immediately joined him.
When they got there he was screaming at them, tears in his eyes. "Who dares to swear on the Styx in my son's name?! Why would any of you do such a thing?! For one second I dared to hope that he was still alive, then it was crushed by the reality that no one could survive the force of Zeus's Lightning Bolt! It felt like everything in me had died, do you know what that's like?! How dare the person that did this!" He kept on going, talking faster and faster until his words were unintelligible. A tsunami had started to form along with a hurricane. He fell to the ground crying, still yelling at the campers.
They stared in shock, by the look of things, they were in the middle of their own ceremony for their fallen friends. Hermes approached Poseidon carefully, and gently laid his hand on his shoulder. He talked to Poseidon quietly. The hurricane and tsunami slowed until they stopped, and the ocean went back to normal again. Hermes then helped Poseidon up, then teleported him back to his palace, he did not return.
"What did he mean by that? Someone sweared in Percy's name on the Styx?" Thalia asked, approaching them. "Poseidon looked... horrible."
"Yes, he has taken the deaths hard, especially Percy's. Gods can hear swears made on the Styx, but we only hear the beginning, when the person states their name, but the rest is private. After our ceremony we heard someone swear on the Styx, and they swore using Percy's name. As you can imagine, this was very shocking. Whether the person who used Percy's name only meant it as a way to remember him, it hurt him to hear that swear. To hear his son's name being used, as if he was still alive. It was a very hard blow to him, furthering the coffin of despair he has built for himself. I would advise you to inform all demigods never to do anything like this again." Zeus said solemnly.
Then the gods disappeared, leaving the campers confused and angry themselves. Why would someone use Percy's name while swearing on the Styx? Thalia narrowed her eyes, now she was suspicious. First, Grover swears that he felt Percy's aura, and now someone sweared using his name? Something wasn't right about this, and Thalia was going to figure it out, no matter what. If only she could consult Nico, and ask where Percy's soul was, because the last time she visited and asked Hades, he still wasn't in the Underworld. Then she smiled mischievously, maybe she could consult Nico after all. With that she took off towards the woods to find Grover, she needed some music.