Type: General
Source: Races of Stone
You draw magical power from the earth beneath your feet.
Prerequisite: Con 13, Wis 13, Earth Sense, Heighten Spell.
Benefit: As long as you are standing on stone or unworked earth (including normal soil), you can use the Heighten Spell feat to added effect. if you cast a spell using a spell slot one level higher than the spell's actual level, the spell is treated as a spell of two levels higher and your effective caster level is increased by one. If you use a spell slot two levels higher, the spell is treated as three levels higher and your effective caster level is increased by two, and so on.
You cannot gain the benefit of this feat when casting a spell with the air, fire, or water descriptor.