Destructive Wave
Destructive energy ripples outward from you in a 30-foot Emanation. Each creature you choose in the Emanation makes a Constitution saving throw. On a failed save, a target takes 5d6 Thunder damage and 5d6 Radiant or Necrotic damage (your choice) and has the Prone condition. On a successful save, a target takes half as much damage only.
Destructive Wave 5.5e 2024 vs. 5e 2014 edition differences
The 2024 version specifies an "Emanation" with a 30-foot radius, while the 2014 version states a 30-foot radius centered on self. The 2024 version explicitly states creatures "in the Emanation" make the save, and the damage is split into Thunder and Radiant/Necrotic, with the prone condition applied on a failed save.