Silence

2nd-Level Illusion (Ritual)
Casting Time: 1 action
Range: 120 feet
Components: VS
Duration: (C) 10 minutes

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.

At Higher Levels. When you cast this spell using a spell slot of 4th or 5th level, the duration is concentration up to 1 hour. When you cast this spell using a spell slot of 6th level or higher, the spell lasts until dispelled, without requiring your concentration.

Source: PHB 275, SRD

Changelog

Added upcasting option.