Coldfire Vortex

You create a spinning vortex of brilliant but frigid energy around your foe. Racing streamers of luminous coldfire lash all creatures nearby. Target one creature within range and they do a CON saving throw. If they fail, they take 4d10 (choose cold or radiant damage). Then each creature adjacent to the primary target must make a DEX sav. If they fail, they take 2D10 Cold or Radiant damage. For both saves, If they succeed then only half damage. If you have a pact with the Celestial: You gain a bonus to damage rolls against the targets equal to your CHA modifier.