1 action
Self (5-foot radius)
S
Instantaneous
You create a burst of thunderous sound, which can be heard 100 feet away. Each creature other than you within 5 feet of you must make a Constitution saving throw. On a failed save, the creature takes 1d6 thunder damage.
The spell’s damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).
Source: Xanathar's Guide to Everything