Draconic armor

Type of Feat: Class Prerequisite: Red Dragon Disciple 1 Specifics: The character becomes more draconic in appearance. His skin develops tiny iridescent scales, nearly invisible. This provides increasing natural AC. Use: Automatic
 * Level 1 +1
 * Level 5 +2
 * Level 8 +3
 * Level 10 +4

BoW Changes
The Red Dragon Disciple class has been changed so they "gain" -25% Cold Vulnerability, -2 Discipline and -2 AC upon reaching level 10. The penalties are cumulative, which means a character who is 8 PM and 10 RDD get both penalties.