Vigilance

Vigilance represents how attentive you are when you are not actively looking out, so whenever you are not making an awareness check. This is used to detect others that are trying to sneak up on you or trying to move past you undetected. In that case, the GM makes a stealth check for the sneaking creature and the difficulty is your vigilance.

If you are about to walk into a trap, your vigilance is checked against the trap's stealth to determine if you walk into it.

Your vigilance is 8 plus your awareness ability modifier. Inform the GM what your vigilance is at the start of an adventure and when the value changes.