Archives of Nethys

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Chapter 8: Tactical Rules / Senses

Dealing with Unseen Creatures

Source Starfinder Core Rulebook pg. 261
If you are unaware of a creature, aware of a creature’s presence, or aware of a creature’s location, that creature is considered to be “unseen” for you. A stationary unseen creature has a +40 bonus to Stealth checks, but this bonus is reduced to +20 if the unseen creature moves (and these bonuses are negated for potential observers with blindsense). An unseen creature benefits from total concealment (50% miss chance) against attacks. In addition, you are considered flat-footed against an unseen creature’s attacks.

If you are unaware of a creature or aware only of its presence, you cannot directly attack it. You must first succeed at a Perception check to pinpoint the creature’s location, which then allows you to become aware of the creature’s location (if using an imprecise sense) or to observe the creature (if using a precise sense). If an unseen creature makes a melee attack against you from a space adjacent to you, you automatically determine its location, though this doesn’t stop it from moving after the attack.