Veil the Voice

Your spoken words disappear into shadow. The triggering spell produces no audible sound from your voice or the casting itself (though its effects are still visible and can be noticed normally).

Creatures relying on hearing to notice spellcasting have disadvantage on checks to identify that you cast a spell (DM adjudication).

At Higher Levels: If cast with a 2nd-level slot, you can apply this to a spell you cast within the next 1 minute (no reaction required), ending after you use it once.