Alertness (Mythic)
Your powers of perception surpass everyone’s, whether used to observe your surroundings or the intentions of others.
Prerequisite: Alertness.
Benefit: The bonus on Perception and Sense Motive skill checks from Alertness increases by 2. In addition, you can expend one use of mythic power to treat a Perception or Sense Motive check as if you had rolled a natural 20. You must decide to use this ability before making the roll.
Source: Mythic Adventures, p. 54