Covert Caster

You are adept at concealing your spells from vigilant eyes. You gain the following benefits:

• When your are hidden from a creature you can attempt a Stealth check, against the passive Perception of any watchers, as part of your spell casting to conceal that you are casting a spell. Though the visual and auditory effects (if any any) of the spell will still be obvious, such as a ray from a firebolt spell.
• When you cast a spell you can attempt a Deception check, against the passive Arcana of any watchers, as a part of the casting to obscure exactly which spell you are casting. If the spell is a class spell, then any creatures of that class gain advantage on their passive Arcnana.