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Pathfinder 2e Database

Detecting Creatures

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ObservedA creature you're observed by knows where you are and can target you normally.
ConcealedA creature that you're concealed from must succeed at a DC 5 Flat when targeting you with a non-area effect.
HiddenA creature you're hidden from knows the space you're in. It is Off Guard to you, and must succeed at a DC 11 Flat to affect you. You can Hide to become hidden, and Seek to find hidden creatures.
UndetectedWhen you are undetected by a creature, it's Off Guard to you, can't see you, has no idea what space you occupy, and can't target you. It can try to guess your square by picking a square and attempting an attack. This works like targeting a Hidden creature, but the flat check and attack roll are rolled in secret by the GM.
UnnoticedA creature you're unnoticed by is unaware of your presence.
InvisibleYou're undetected by everyone. You can't become observed while invisible except via special abilities or magic.

Section: Playing the GamePathfinder Player Core pg. 434

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