All Beyond the Yonder Seas and Streams
5-level Transmutation
You befoul water in a 100-foot cube originating from you. Any water that remains in the area during the entirety of the spell's casting time becomes fouled for the duration, even if it later leaves the area. When a creature drinks from the water, breathes in the water, or spends more than 1 minute within the water, it must succeed on a Constitution saving throw or become poisoned for 24 hours. A poisoned creature must repeat the saving throw every hour, taking 1d6 poison damage on a failed save.
When you cast this spell using a spell slot of 7th level or higher, you can befoul water in a 1,000-foot cube, and the water remains fouled for 30 days. If you cast this spell using a spell slot of 9th level, you can befoul water in a 1-mile cube, and the water remains fouled until the spell is dispelled.
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