Heliana's Guide to Monster Hunting, pg. 501
3rd ring Arcane, Evocation
With a boom that can be heard 300 feet away (or 1000 feet in a liquid), a pulse of thunder ripples out from a point you choose within range. Each creature in a 20-foot-radius sphere centred on that point must make a Constitution saving throw. A target takes 7d6 thunder damage on a failed save, or half as much damage on a successful one. This damage increases to 9d6 if the affected creature is submerged in a liquid.
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