Breath of Tiamat

A multicolored fog comes out of your mouth. Any living creature in a 60ft cone must make a Constitution or Dexterity saving throw (their choice.) On a fail, the target takes 3d10 lightning damage, 3d10 acid damage, 3d10 poison damage, 3d10 fire damage, and 3d10 cold damage. On a success, the target takes half of the overall damage. This spell ignores resistance or immunity to any damage type.