From publisher blurb:
Monster Brief provides a small selection of new, revised, or expanded creatures to be pitted against your players.
This time around, you find yourself presented with four new types of dragons to help, hinder, or gobble up your heroes. The arcane dragon is a reclusive creature that is said to be made of magic itself, and thus wields great arcane power. The mock dragon better not hear you call it that, or it won't help you when you need it most. The sand dragon, despite not being able to fly, has its eye on your magic items and will do whatever it takes to get them from you, including coming up from beneath your feet. The viper dragon has an attitude as bad as its venom is poisonous.