True Arcanist

You have delved into the depths of magic such that you gain the following benefits:

• You no longer need to use somatic and/or verbal components when casting a spell.
• When you cast a spell without using somatic or verbal components, as a free action once per spell a creature can make an Investigation check contested against your Spell Save DC. If successful, the creature detects you as the source of the spell. If not, your casting is undetected.