Thunderwave

1st-level (evocation; arcane, nature, thunder)
Class(es): Bard, druid, sorcerer, wizard
Casting Time: 1 Action
Range: Self
Area: 15-foot cube
Components: V, S
Duration: Instantaneous
Saving Throw: Constitution halves and negates push

You create a wave of thunderous force, damaging creatures and pushing them back. Creatures in the area take 2d8 thunder damage and are pushed 10 feet away from you. 

Unsecured objects completely within the area are also pushed 10 feet away from you. The thunderous boom of the spell is audible out to 300 feet.

Cast at Higher Levels. The damage increases by 1d8 for each slot level above 1st.