Mithral Body (feat)

Prerequisites: Warforged, special (see below)
Benefit: Your armor bonus is increased to +5, and you are considered to be wearing light armor. You now have a +5 maximum Dex bonus to AC, a -2 penalty on all skill checks that armor check penalties apply to, and an arcane spell failure chance of 15%.
Normal: Without this feat, your warforged character has an armor bonus of +2
Special: If you take this feat at any time other than first level there is an additional prerequisite. You must also spend the time and money normally required to craft mithral armor to benefit from this feat.

Mithral Body (feat)

The Crown of Sorrows KeiranCoon