Detect Shapechanger
(Divination)

Range:  10 yards
Components:  V, S
Duration:  1 round per level
Casting Time:  1 round
Area of Effect:  One creature per level
Saving Throw:  Negates

By means of this spell a wizard can see the true form of any shapechanging creature. On the first round of viewing, the victim is allowed a saving throw versus spell. If this saving throw is successful, the wizard will think that the creature cannot shapechange. If the saving throw is failed, the wizard will know whether the creature has the ability to change form. On the second round of viewing, the wizard then sees the true form of the creature. There is only a saving throw on the first round, not on the second. Note that a wizard who knows polymorph self or shape change will be detected as a shapechanger, even if neither spell is currently memorised (the same goes for druids in their true form). This spell will not detect or see through illusions.

