Infiltration Automaton

You have quiet, well-oiled joints, and you move around as silently as a shadow, though you sometimes use a magical boost. You gain a +2 circumstance bonus to Stealth checks against hearing-based Perception checks. You can cast Silence once per day on yourself as a 2nd-rank arcane innate spell.

Enhancement You can cast silence twice per day on yourself, and you can choose whether to cast it as a 2nd- or 4th-rank spell.