Chiaro, the spirit of light. Cunning devil at the hand of Reverie. While he won't harm a human directly, his quizzes and games will. He is quite knowledgable and quite powerful. And he is often sought out to have a pact formed with him. Reasons being that so few have one with him, are the fact that they cannot pass his test. A deadly 'game'.
Chiaro, being blessed by Reverie himself, holds the knowledge of the world. However, he can only manifest his power in the form of illusions designed to trick and frighten his enemies: another facet of his trial for pact-seekers. The only way his powers can be directly used to inflict harm is by creating a weapon for one who holds a pact with him, which is as real and stronger than a weapon forged by human hands.