Condition — Undetected

Creatures have no idea where you are. The strongest stealth condition.

Mechanical Effects:

• Creatures must guess which square you occupy to target you
• Even if they guess correctly, they must succeed on a DC 11 flat check to hit
• Creatures can't use reactions triggered by your actions (since they don't know you're acting)
• You can use Sneak to remain Undetected while moving

How Applied:

• Successfully Sneaking while already Hidden
• Being invisible with no non-visual cues
• Being in an area where creatures can't detect you at all

How Removed:

• Seek action by a creature (Perception vs. your Stealth DC) — you become Hidden or Observed
• Making noise, leaving visible traces, or otherwise revealing your general location (become Hidden)
• Attacking (typically become Observed or Hidden depending on circumstances)
• Entering a creature's non-visual detection range (tremorsense, etc.)

Undetected vs. Hidden:

Undetected is strictly better than Hidden because the enemy has to guess your location first.

Tactical Impact: Undetected is the gold standard for stealth. A Rogue who Sneaks into Undetected can choose any angle of attack. Enemies waste actions Seeking or attacking empty squares. Sneak Attack from Undetected is devastating.