Feybeasts

Feybeast are beasts which are able to wield mana. When they are killed properly they turn into feystones.

Schumil
A Schumil looks like a rabbit. Due to its cute appearance and small size it is kept as a pet by nobles. Sylvester compares Myne to a Schumil making her chirp "pooey" (ぷひ puhi) which is likely a Schumil's cry.

Zantze
A zantze is a cat-like feybeast which is about knee-high and not particulalry strong. It evolves through absorbing mana by eating ruelles or other feybeasts. The next evolution is called fetze.

Goltze
A Goltze is a strong feybeast and the last evolution stage of a zantze. It is much taller than a zantze reaching heights of a two-story-tall building.