Crystals

Crystals are a crystallized source of power residing within monsters. Destroying them means killing the monster. In the web novel and light novel, animals do not have crystals. The stronger the monster, the better the crystal, and the more crystal points it gives to Teacher.

Alternate names

 * Gems
 * Magic Stones
 * Demon Stones
 * Cores

When absorbed
So far, Teacher is the only one capable of absorbing crystals, and therefore the only one able to taste them. Rather than different flavors, it is more akin to the quality of magic deciding the taste.

Demonkin
The crystals of the demonkin have a vaguely spicy taste.