Still Spell

You can cast spells without gestures.

A stilled spell can be cast without somatic components. Spells without somatic components are not affected.
This ability is similar to the Somatic Concealment non-weapon proficiency, but modifies the magic itself, as opposed to attempting to hide the component from prying eyes.

An stilled spell adjusts a spell by one level.

Still Spell

Forgotten Realms: Birthright Avanpallandt