Metal skin

Metal skin was a common spell used by wu jen in Kara-Tur.

Effects
When cast, this spell altered the skin of a creature, causing their skin to become as hard as steel. The creature's movement was slowed for the duration of the spell. A creature who has had this spell cast on them became vulnerable to the magnetism spell.

Components
In addition to verbal and somatic components, the spell required a material component, the wu jen swallowed a piece of rhinoceros skin.