The Quill of Truth:

Once per session the wielder of the Quill of Truth may use a charge to write something with it, and have it come true. This acts as a free casting of the (6-cost) Pact spell which will gain a bonus or penalty to the usually secret d20 roll equal to the wielder's cunning to a max of +3. The d20 roll is no longer secret, but it still cannot be denied. The effects and 'cost' of this pact may only last a single session. This artifact has five charges, and regains one charge each time an artifact of any quality is sacrificed while it is equipped.