From publisher blurb:
Forged in the belly of a great dragon, or through the binding of magic, flesh and scale, the Dragonspawn are a mighty and rare people, with the flame of their great progenitors burning through their bodies.
The Dragonspawn is a Companion Class for Dungeon World - Companion classes are complimentary subclasses designed for use alongside standard playbooks. At character creation, simply pick a normal playbook (Fighter, Wizard, etc) and also select a Companion Class. Throughout character creation and play, you may select options from either sheet.