Thunderous Strike

Using a melee weapon, make a melee weapon attack. In addition to the weapon attack on your target, all creatures within 10ft of your target must succeed Strength saving throw or take 1d4 thunder damage and are knocked prone if they fail. All creatures within 100ft hear a thunderous roar along with this spell.

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, you deal an additional 1d4 thunder damage for each slot level above 1st.