Earth

As a standard action, you can unleash an acid dart targeting any foe within 30 feet as a ranged touch attack. This acid dart deals 1d6 points of acid damage + 1 point for every two cleric levels you possess. You can use this ability a number of times per day equal to 3 + your Wisdom modifier.

At 6th level, you gain resistance to acid 10. This resistance increases to 20 at 12th level. At 20th level, you gain immunity to acid.