Sara

Erklings would make absolutely no sense. Those are from The Witcher--not the Harry Potter series. Blending the two universes seems like a weird fan-fiction and unnecessary for the games. There's an entire directory of creatures to choose from in "Fantastic Beasts and Where To Find Them", as well as those mentioned in the series itself: dragons, doxies, pixies, demiguises, gnomes, ghouls, etc.