Transmutation
Level: Sor/Wiz 3
Components: V, S, XP
Casting Time: 10 minutes
Range: Touch
Target: Living creature touched
Duration: Instantaneous
Saving Throw: Fortitude negates (harmless)
Spell Resistance: Yes (harmless)

In order to cast this spell, you must have a familiar. When you cast the spell, the target creature becomes a shadow creature. The creature retains its basic shape, but it is infused with energies from the Plane of Shadow. (It gains the Shadow creature template as described in Manual of the Planes).

You lose any special ability the familiar previously granted to you. However, you gain a replacement special ability, +2 bonus to Move Silently. 

If the target creature is your familiar, it gains Cold Resistance and its additional supernatural abilities as though its Hit Dice were equal to your character level.

Only a limited wish, miracle, or wish or similar magic can restore a transmuted familiar to its original state. Otherwise, the familiar remains a shadow creature forevermore. You cannot cast this spell on another character's familiar. Most creatures consider the transformation harmless and beneficial, but if the creature decides to resist, a successful Fortitude save negates the spell.