Subtle Caster

You have mastered the ability of casting spells without drawing unwanted attention. You gain the following benefits:

• Increase your Dexterity modifier by 1, to a maximum of 20.
• When casting a spell that requires Verbal components, you can whisper the spell. If trying to cast subtly, creatures with a passive Wisdom (Perception) of 20 or creatures that succeed on a Wisdom (Perception) check DC 15 + the spells level, can identify you as the caster of the spell.
• You are considered proficient in Dexterity (Sleight of Hand) checks when trying to cast a spell requiring Somatic components subtly, and gain advantage on those checks. The DC for a successful check is DC 10 + the spells level. On a failure, you are identified as having cast the spell.