Crucifixion

You summon a divine cross, which erupts out of the ground in at a point within range. Each creature within 10 feet of the cross must make a Dexterity saving throw or take 10d6 bludgeoning damage or half as much on a success. Also, the area becomes difficult terrain. Then, you choose one creature within the 10 feet radius area. That creature must make another Dexterity saving throw. On a fail, this creature is nailed to the cross for 1 minute, and is restrained for the duration. They take 20d6 piercing damage, and is then struck by lighting, dealing a further 20d6 lightning damage. On a success, the creature is not nailed to the cross, but instead takes half as much lightning damage.

Any creature nailed to the cross takes 5d6 piercing damage at the start of their turn and can remake the save at the end of their turn, ending the effect on a success.