The vision crystal spell turns any transparent or reflective object into a crystal ball with the power of clairaudience, as described in the DMG. The spell functions on any suitable object-a small mirror, a gemstone, even a piece of clear glassware-with a minimum of preparation. Vision crystal also lasts one full turn plus one round per caster level. The caster can cast comprehend languages, read magic, tongues, infravision, and ultravision through the vision crystal, and has a 5% chance per level of successfully casting detect magic, detect evil or good, and message through the crystal if the spells are memorized when the crystal is activated. No other spells can be cast through the crystal.
The crystal or reflective object is unharmed by the casting and can be used repeatedly.
Notes: Restricted to diviners, witches, and savants; rare.