Dax'Salene's Catastrophic Finale

You summon a catastrophe on a point you can see within range. Storm clouds and eruptions rain and spew forth hellfire, massive icicles, and powerful lightning storms. All creatures within 30 feet of the chosen point must make a Dexterity saving throw. On a fail, the creature takes 6d12 fire damage, 6d12 cold damage, and 6d12 lightning damage. On a success, the creature takes half of that damage.

Additionally, the effects of the spell continue for the next minute. Any creature that ends its turn within the affected area during the duration takes 2d12 of each of the aforementioned damage types.

The stress of the spell also causes you to temporarily lose half of your current hit points for 1 hour.