A Child of Artemis

Prelude

I've been thinking and hoping to write about, a crossover between Harry Potter and Percy Jackson. When James and Lilly married, Lilly finds out that she's been cursed by Severus Snape, that she can't have children when she married James. In desperation James and Lilly found a rite that can call upon the 'old ones' for a single request, as long as you do them a favor in return. When they did the rite, they had no Idea that the rite would summon a goddess and that goddess would be Artemis. When Artemis was summoned she was furious, but listens to the couple's request. Artemis then thinks that she always wanted a child of her own and proposed that she would merge a portion of her own essence into Lilly. Lilly then would become with child, and the child would become a demi-god a child of Artemis and of James and Lilly. A child with three parents half Artemis and a quarter James and a quarter Lilly. Artemis then told them that their child would be her first and only child, and the her child would be very strong and could attract monsters, and if that happens to send the child to a special camp for half-bloods for special training. Nine months latter Lilly had girl named Diana Nightshade Potter. This is her story, and how she affects the world around her.

This is my first story, tell me what you think.
P.S. I need a good Beta reader.