Harry is op. Please read the supplementary chapter

Elanor is a displaced witch, fortunately she has experience thanks to her mentor. Now she's going to help the first human Trollhunter survive, and give him the help she never got. She just never expected to find love along the way. She just knows Zelretch is laughing at her though...her luck was chaotic enough that she would end up meeting the last apprentice of Merlin himself!

A l'aube d'une ère nouvelle pour la communauté magique, Potter et Malefoy sont envoyés à Arcadia, Californie, pour favoriser l'intégration de jeunes trolls dans un lycée no-maj. Mais tout part en vrille quand Arthur touche un objet ayant appartenu à Merlin... [Les Passeurs d'Âmes, épisode 5]

After his birthday, Jim no longer associate himself with his father. Now in New Jersey, he learns something about his father's side of the family, or at least what's left of it.

What if the 'power he knows not' was something even Dumbledore could not hope to guess. After all, the wizards are not the only ones keeping their world a secret. Everything changes when Harry happens upon a glowing amulet in the middle of a rock pile one summer. Story begins in the summer before 5th year. Trollhunter!Harry