Scroll of Silence

The text on this worn-down scroll appears unintelligible, but they seem to be for some sort of spell.
For the duration, no sound can be created within
or pass through a 20-foot-radius sphere centered
on a point you choose within range. Any creature
or object entirely inside the sphere is immune to thunder damage, and creatures are deafened
while entirely inside it. Casting a spell that
includes a verbal component is impossible there.