The Archive of Esoteric Secrets

Blistering Geyser

4-level Evocation

You shoot forth a blast of scalding water in a 30-foot long, 5-foot wide line. Each creature caught in the line must succeed on a Dexterity saving throw or take 4d6 bludgeoning damage, plus a further 2d10 fire damage at the start of its next turn. A creature that fails the saving throw also falls prone. A creature that succeeds the saving throw takes half damage.
 
At higher levels: When you cast this spell using a spell slot of 5th-level or higher, the fire damage dealt increases by 1d10 per spell slot level expended above 4th