If you have recorded ten or more unique numbers using your ValdaSpire24 feature, you can take a Magic action to clear all of your recorded numbers and throw a burst of darts. Each creature in a 60-foot Cone must make a Dexterity saving throw. A creature takes 1d8 Force damage for each unique recorded number on a failed save, or half as much damage on a successful one.
Once you use this feature, you can't do so again until you finish a Long Rest.