Dragonskin(Draconomicon, p. 112)
Level: Sorcerer 3, Wizard 3, Spellthief 3,
Components: S, M,
Casting Time: 1 standard action
Duration: 10 minutes/level
Your skin toughens and becomes scaly like that of a chromatic dragon, of a color that you select. You gain an enhancement bonus to your natural armor equal to +3, +1 per two levels above 5th (to a maximum of +5 at 9th level), as well as energy resistance equal to twice your caster level (maximum of 20 at 10th level) against the type of energy appropriate to the color you select: acid (black or green), cold (white), electricity (blue), or fire (red).
Material Component: A dragon's scale.
Special: Sorcerers cast this spell at +1 caster level.