Earth Heritage( Planar Handbook, p. 38)
You are descended from creatures native to the Elemental Plane of Earth. You share some of your ancestors' natural stability and physical power.
Your stability grants you a +4 bonus on checks to avoid being bull rushed or tripped while standing on the ground. This bonus stacks with the benefi ts of similar effects, such as a dwarf's stability. You also gain a +1 bonus on weapon damage rolls if both you and your foe touch the ground.