Edu's Loud Image

You magically create an image, effect, or phenomena that is deafeningly loud to those nearby. The illusion must fit within a 10-foot cube, and the sound created must match the visual appearance of the illusion in an appropriate manner. The illusion appears within a spot within range, and you can use your action to move the illusion, which can change to make it appear natural. A marching band may walk and shout, and a roaring dragon may shake its head and open its mouth when it roars. The sound the illusion makes is audible from up to 300 feet away, though it is purely visual and audible. It does not create smell, temperature, or other sensations.

While the illusion persists, creatures within the area or within 10 feet of the area's edge must make an Intelligence saving throw at the start of each of its turns. On a failure, it takes 2d6 thunder damage and it is deafened until the start of its next turn. On a success, it takes half as much and isn't deafened. 

Physical interaction with the image reveals it to be an illusion, because things can pass through it. A creature that uses its action to examine the image can determine that it is an illusion with a successful Intelligence (Investigation) check against your spell save DC. If a creature discerns the illusion for what it is, the creature can see through the image, and it does not take any further damage.

At Higher Levels: When you cast this spell using a spell slot 3rd level or higher, the damage increases by 1d6. Alternatively, you can increase the area of the spell by 10 feet (5 feet on each side).