Dante's Inferno

You create a pillar of flame, 50 feet in radius, 200 feet high, centered at a point you can see. This flame passes through nonliving objects and ignores cover. All creatures within the pillar must make a DC 25 dexterity check, or take 20d20 fire damage (half as much on a successful save), each turn they are within the pillar. This spell also sets all creatures within the pillar on fire, dealing 4d6 damage per turn, until they take an action to put themselves out. The pillar remains until you fall unconscious or dispel it as a bonus action.