Cyric's Curse

You touch a creature and send negative energy flowing through it. When you use this spell, the creature which you touch along with any other creature within a 15-foot cube must make a Constitution saving throw. On a successful throw, the creature takes half the damage, on a failed throw the creature takes 3d6 radiant damage. Creatures that affected by this spell take 10 (2d4 + Your Con Modifier) poison damage and then are poisoned for 5 minutes. This spell may only be used 3 times per long rest.

The damage of this spell increases by 1d6 when you reach 3rd level (4d6), 6th level (5d6), 11th level (6d6), 14th level (7d6), 17th level (8d6) and 20th level (9d6).