You unleash the wrath of the Emerald Dream in a violent surge of natural force. Choose a point within range. All creatures of your choice in a 30-foot-radius sphere must make a Constitution saving throw.   On a failed save, a creature takes 10d10 nature damage and has disadvantage on Constitution and Dexterity saving throws until the end of its next turn. On a successful save, the creature takes half damage and suffers no additional effect.   Any creature reduced to 0 hit points by this spell erupts in a burst of overgrown plant life.   Cannot be cast in Wild Shape.