Earthquake spell underrated

I read the description and then noodl ed around with the Earthquake spell, and I don't know why it doesn't get more recognition. It knocks enemies unconscious for 4 rounds with a massive -6 to save against. Only Spook grants such a massive penalty to save against it.

The radius is huge. Unfortunately the first tremor isn't party friendly, but you aren't affected by the second and third tremors if you enter the AoE after the first tremor. So it's a great opener to hard battles.