The New Kids (Percy Jackson and Miraculous Ladybug crossover)

A few new kids appear at Collège Françoise Dupont. They seem nice and friendly and quickly become good friends with the civilian form of Paris's protectors.
But just because Marinette's new friends look athletic and awfully powerful, that doesn't stop Lila from cooking up some new lies in giant cauldron. She successfully swayed Alya and Nino, and the rest of the Akuma class just as most of the new kids had to return to New York due to "private matters", leaving their huge, hella expensive mansion to a one of their friends, also a demigod in disguise.
Meanwhile, a new superhero mysteriously appears out of nowhere and joins the team with a lost miraculous no one has heard of. Hawkmoth believes that this piece of jewelry might be the key to his success of gaining both Ladybug and Cat Noir's miraculous.
Can Marinette solve her friendship problems...And consider the fact that one of her few friends had just turned a hair pin into a sword and turned the pretty, new girl into dust?