Hydaelyn

You create a virulent outbreak in a 15ft. cube at a location you can see within range. Each creature in the affected area must succeed on a Constitution saving throw or take 6d4 poison damage and become poisoned for up to 1 minute. On a success, creatures take half as much damage and suffer no other consequences. While concentrating on the spell, you may use your action to cause the disease to spread, affecting creatures within 15ft. of an affected creature. At the end of a poisoned creature's turn, they reattempt the saving throw, ending the poison on a success.