Lesser Wyverns

Lesser Wyverns are fearsome monsters which have the ability to destroy a village. Lesser Wyverns' crystals are located in the neck.

Appearance
Teacher has only encountered one, and it had blue scales, if the Light Novel volume 1 cover's dragon is the Lesser Wyvern (and it probably is since it's the only dragon-like monster in volume 1). It has a soft underbelly.

Abilities
Lesser Wyverns are E-Ranked Threats when alone. They can fly at supersonic speeds, but not faster than bikes or cars, and use a strategy of hitting and running.