Disclaimer: I do not own anything. All characters belong to their respective fandoms and authors.

This is a rewrite of a story I attempted to write three years ago, which went by the name "Child of Magic, Legacy of the Seas". This is based off a prompt given by icyquest4 ages ago and is a crossover between the Harry Potter universe, the Percy Jackson universe, and the Avengers universe.

*Edited Jan 19, 2019: I have edited out all the previews and such, as well as conglomerated a few chapters. The short chapters before were in an attempt to get them out quicker, but in hindsight, that was actually a really lazy way to do it, so I apologize to anyone who was disappointed. I've also altered the timeline slightly, not that it was very noticeable.

Some notes from the chapters that were combined:
1. To any hardcore fans of the events or characters from Heroes of Olympus that weren't in Percy Jackson's main series, I apologize but I haven't read that series, nor do I intend to, and I also do not intend on referencing them in this story.
2. The title came about as a result of me googling a whole bunch of things, before finding a website referencing tarot cards. The title 'child of worlds' directly references a tarot card more commonly known as the 'Page of Pentacles'. While the meaning of the tarot card is only somewhat relevant to this story, I quite liked it and the name stuck. (Although if you find a title that you would think more fitting, feel free to suggest it!)

April, 2012

"Lily!"

Her heartbeat thudded in her ears. The door that served as a barrier between them was racked by incessant knocking and pounding on the door.

"Lily, please!"

She was a fool. She thought - she thought that he'd changed from the brash and selfish eleven year old. For being the supposed 'brightest witch of her century', she sure wasn't as observant as she thought. But it had been so convincing - everyone thought that he'd matured. Everyone believed that James Potter grew up from the boy who flipped girl's skirts and flirted with everything that had legs.

"Lily, babe, hear me out."

Bright, sharp green eyes flitted over the bathroom she had locked herself into. Then she focused. She couldn't - she wouldn't - she would not stay here. No, not ever again. But first, she had to leave something behind. She didn't want to be reminded of him.

"Lily, I'm coming in, you have to hear me out!"

Lily Evans closed her eyes and focused. Thankfully, the knocking and pounding on the door quieted.

Destination. Anywhere but here - no, she knew where she was going.

Determination. There was no way in hell that she'd be staying.

Deliberation.

"Alohomora!"

A sharp crack.

The door burst open.

James Potter stared at the empty room before him.

His eyes focused on the abandoned ring on the floor.

Percy stared at the empty air long after the fire went out. The receding heat and the proceeding chill of the night didn't seem to affect him. He tuned out the quiet conversations around him, normally bright eyes dull as he continued staring at nothing.

His fist clenched.

Next to him, Thalia and Nico exchanged mournful looks, but neither disturbed their grieving friend. The loss of the demigoddess hit the both of them hard, as well. Nico had felt her soul cross the barrier. He could only hope that she was in Elysium now, as she deserved to be. He hoped she was happy - happier than her distraught boyfriend.

Thalia, on the other hand, had been present at the time of Annabeth's death. She'd watched the girl who she'd seen grow up to become a hero die at the hands of monster. Percy had killed the monster almost immediately after it injured his girlfriend, but they couldn't stop the teen from bleeding out. Thalia had lost a sister. She gave Percy another passing glance. She could only hope that she wouldn't be losing a brother, as well.

The three cousins stayed in the same spot for a long time. The rest of the campers had all retreated back into their cabins by now.

Finally, Percy sighed.

"It's late." His voice came out flat as he tore his gaze away from where the grey shroud had once stood. Thalia bit back her instinctive 'no, duh' reaction, settling for a nod instead. Percy didn't seem to notice, looking around instead, his expression uninterested in the familiar setting of the camp.