Stone Colossus

(Races of Faerun, page 169, DnD 3.0)

[General]

You can focus a part of your power to increase the toughness of your skin.

Prerequisite

Base Fortitude save +3, earth genasi

Benefit

When you use the attack action or full attack action in melee, you can take a penalty of as much as -5 on your attack and add the same number (up to +5) to your Armor Class as a natural armor bonus. This number may not exceed your base attack bonus. The changes to attack rolls and Armor Class last until your next action.