You have learned to conceal the hand motions and the incantations for your spells. You may use your Short action to modify a spell you are casting with your Main action.1) When you do so, no observer automatically realizes that you have Cast a Spell. If another character has reason to believe that a spell has been cast, they must roll+FOR.
Complete Success: The observer is certain that you have Cast a Spell, and can point to evidence to convince others.
Success: The observer is certain that you have Cast a Spell, though they cannot prove it.
Partial Success: The observer suspects that you might have Cast a Spell, and takes forward favour the next time they try this roll against you.
Failure: The observer does not know who Cast the Spell.
Complete Failure: The observer believes that any observed magical effect was due to a magical trap, a curse, or some other non-spell source of magic.
Add the following to the list of Good Things for the spell you made Subtle: