Earthquake

This spell creater 3 tremors first dealing 6-36 damage(save vs. spell with -6 penalty for half), second 6-18 (save vs. spell for half) and third 6-12(save vs. spell for half). Creature that failed any of saves also falls to the ground. Tremors affects both enemies and allies. Every time Earthquake is casted Earth elemental might appear and attack caster and his allies.