The caster causes a massive earthquake around himself, causing 1d6 points of damage per caster level (reaching 25d6) to all creatures in the area of effect. The caster is not affected by the earthquake. At caster level 25, the damage increases to 1d8 per caster level (reaching 60d8), and the damage type switches from bludgeoning to positive. A successful fortitude save halves the damage.
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