In the final stages of my Earth/Earth dom. I've been told to put it in either a spammable power, or a aoe. My slottable AOEs or spammables are my ST hold, my main aoe stun, and my short range aoe with potential stun, Fissure.
Only thing I'm not looking at taking in it is Mud Pots. Earth/Earth has enough powers as is with people slowed or on their butts. Only other power in Earth Assault that's MAYBE not vital is Hurl Boulder?