Detonate

You launch a glass or crystal bead to a point you can see within range which then explodes in a 5 foot radius sphere. Each creature within the radius must make a Dexterity saving throw or take 1d10 fire damage and 1d10 thunder damage, half on a success. Creatures that fail an additional Constitution saving throw are deafened for 1 minute or until they succeed on the saving throw on the end of their turn. If they fail this Constitution saving throw by 5 or more, they are also stunned for the same duration. 
At higher levels: When you cast this spell at higher levels, both damages increase by 1d10 and the radius increases by 5 feet.