Buy one, get one free. To purchase the powers and services of one, you must unshackle another. Mumbled words of power smolder on your tongue and the chains of one curl tightly around your fist. A whiff of sulphur and the chains of another fall to the floor. As the sound of wingbeats fades into the distance, their cackling echoes in your ears. You have bought one at too high a price. And you have allowed another to get free.