Improved Natural Armor
(Races of Faerun, page 165, DnD 3.0)
[General]
Your skin is even tougher than that of most of your kind.
Prerequisite
Racially granted natural armor
Benefit
Your racially granted natural armor bonus increases by +1.
Special
A character can gain this feat multiple times. Each time the character gains this feat, his natural armor improves by an additional +1.