Eyepatch of the seer.
Eyepatch of mysteries
once per day, you may as a swift action increase your caster level by one for any bonus revelation spell you cast.
This eyepatch was once used by a cult of religious fanatics who were devoted to a supposedly divine seer. Her unexpected death made the cult commit ritual suicide. The ritual created a magical effect on the eyepatches worn by the cultists. Now anyone who wears the patch can catch a glimpse into the mysteries of the universe with the covered eye.