Dragon Scales

This spell causes the body of the caster (or any single person or creature touched by the caster) to become completely covered with dragon scales, effectively raising the subject's Armor Class by 2 for the duration of the spell; this modification is in addition to the subject's normal AC (for instance, if the subject's AC is 6, dragon scales raises it to 4).
The color of the dragon scales is the same as that of the scale used as the spell's material component; however, the color has no bearing on the effect of the spell. Dragon scales also temporarily reduces the subject's Charisma by 2 points.

[Complete Wizard's Handbook]

School: Abjuration
Level: 6
Rarity: Rare

Range: Touch
Components: V, S, M
Duration: 1 turn/level
Casting Time: 1 round
Area of Effect: One creature
Saving Throw: None

Material Components:
a scale from any dragon