Poison Matrix (5e Spell)
From D&D Wiki
A 60-foot cube centered on a point within range is filled from every direction by intersecting green rays of poison. Each creature in the area must make a Constitution saving throw. A creature takes 7d10 poison damage and becomes poisoned for 1 minute on a failed save. On a successful save, a creature takes half damage and isn't poisoned. A poisoned creature can make a new saving throw at the end of each of its turns, ending the effect on itself on a success.