Surshana's Shrieking Skull

You throw a cackling skull at a point you can see within range, which emits a mortifying shriek audible out to 300 feet.
Each creature within a 10- foot cube centered on the skull takes 2d4 thunder damage, without making a saving throw.

if the caster tries to use a skull that is larger than medium the skull will be consumed but the damage and size of the cube and audible range changes to 4d4 thunder damage for large, 6d4 thunder damage and a 15 foot cube for huge, 10d4 thunder damage and a 20 foot cube for Gargantuan