Invisible
Invisible creatures are automatically hidden from view and have total concealment as a result.
Hidden: Hidden creatures have a +2 circumstance bonus on attack rolls against opponents that cannot see them and treat all such opponents as Off-guard 1.
Undetected: Hidden creatures have a +4 circumstance bonus on attack rolls against opponents that cannot see them and treat all such opponents as Off-guard 2.
Stealth:
- Creatures with total concealment or total cover have a +5 circumstance bonus to Stealth rolls.
- Creatures with minor/partial concealment or minor/partial cover have a -5 circumstance penalty to Stealth rolls.
- Creatures with no concealment or cover cannot attempt to hide at all.
- The Perception DC to spot a creature with concealment or cover is 5 + their circumstance, Dexterity, and size modifiers to Stealth rolls, if they are not attempting to hide. If they attempt to hide, they make a Stealth roll and their result is the DC instead.