Improves your warforged fortification, granting you immunity to sneak attacks and extra damage from critical hits. However, you lose the ability to be healed by spells from the healing subschool, such as cure light wounds.
Prerequisite: Warforged, Base Attack Bonus +6
Mithral Body
Mithral body counts as light armor and grants a +5 armor bonus, but also provides a 15% arcane spell failure chance, -2 armor check penalty to certain skills, and a +5 maximum Dex bonus. This feat can only be purchased at 1st level.
Prerequisite: Warforged
Adamantine Body
Adamantine body counts as heavy armor, grants a +8 armor bonus and damage reduction 2/adamantine, but also provides a 35% arcane spell failure chance, -5 armor check penalty to certain skills, and a +1 maximum Dex bonus. This feat can only be purchased at 1st level.
Prerequisite: Warforged, Only available at character creation.
Improved Damage Reduction
You gain damage reduction 1/adamantine, or improve your existing damage reduction by 1/adamantine.
Prerequisite: Warforged
Mithral Fluidity
The maximum Dex bonus you have is increased by 1, and the armor check penalties are decreased by 1.