Vow of Silence

This spell is from the Dark Souls spell collection.

A 15-foot-radius sphere of dim purple light surrounds you. Until the spell ends, the sphere moves with you, centered on you.

The effects of all spells cast within the sphere are suppressed. A slot expended to cast a suppressed spell is consumed. While a spell is suppressed, it doesn’t function, but the time it spends suppressed counts against its duration. A spell cast within the sphere remains suppressed even after the caster leaves the sphere, and a spell cast outside of the sphere is not suppressed even if the caster enters the sphere.