Annabeth was happy.
She was old. The oldest demigod in a century, reaching the age of ninety-four. She had outlived all of her friends at Camp Half-Blood, and now she had been taken to a nursing home. The helpers there didn't know what she was, though Chiron had assured her that monsters wouldn't be a problem.
Almost all of her friends had died peacefully. Frank had been first. At sixty-two. He had died in his sleep. Hazel followed him the next day.
Then Jason and Piper had died together. In their sleep. They had been old, older than any demigod. But then no demigod had been so powerful in millenia.
Nico had died in a monster attack on Camp Half-Blood. A hellhound had come up behind him and killed him. Will destroyed the hellhound, then in his rage he had charged into the thickest group of monsters. He had never been seen again, though Hades assured the rest of them that he had been accepted into Elysium.
Leo had died next. He and Calypso had lived a peaceful life, away from Camp, with their machine shop. Calypso hadn't kept immortality after leaving Ogygia. She had carried on, though, for another year and a half, until she had also passed away peacefully.
So only herself and Percy had been left, with their three girls all grown into adulthood and training demigods at Camp.
Then Percy had died.
She had never been so miserable. Although Hades had told her he had achieved Elysium, she felt like killing herself to go to him.
But she wouldn't go to Elysium that way.
The pain had never left her; even now, looking off her patio and remembering the old days, she felt the ache of losing Kelp Head. But the urge to end her own life had left in a month. There had been other things to do.
Now that she looked out at the central garden of the home, touched by Apollo's rays, she thought that it had been a good life. When they had been younger, she and Percy had wished they had been mortal. But now, thinking about it, she realized she wouldn't have had her life any other way.
She was happy.
She knew that when she died she would be with him. She had been told that he had already achieved Elysium once, and tried for rebirth. Then he had been born into the world as a half-blood, and met her.
When she first heard this, she was worried that he would have another girlfriend/wife in Elysium. But Hades told her he had died saving other ten-year-olds in a bus crash.
Now she felt the good part of her life, with none of the bad. Though her friends had gone to the next life, she knew they were happy where they were. And, unlike some people, she had no fear of death. She knew that when she died she would achieve Elysium and be with Percy.
In a flash of light, a hooded man appeared on the porch. He flipped back his hood, revealing a smiling, handsome face she had never seen but imagined.
Thanatos.
He held out his hand to her. In that moment, all the ache and slowness of her old bones left her, and she jumped to her feet.
"Time to go," Thanatos said.
In an hour, they found her, eyes closed, in her chair on the patio. She was sleeping the deepest sleep.
She had gone to be with Seaweed Brain.