Stealth and perception circumstances

Various modifiers affect the Stealth of a creature relative to its observer:

Visual: Visual Perception is irrelevant for things for which you don't have line of sight to them or their reflection or shadow.

Partial Concealment: +1 Stealth. Shadows, mist, crowds, walls, and so on.

Distance: +1 Stealth for being 15m or more away, +2 Stealth instead for being 60m or more away, or +3 Stealth for being 1 km or more away.

Auditory: Can only pick out general direction and distance.

Ambient Noise: +1 Stealth. Multiple conversations, machinery, and so on.

Distance: +1 Stealth for being 10m or more away, +2 Stealth instead for being 30m or more away, or +3 Stealth for being 500 m or more away.

Obstruction: +1 Stealth. Sound-dampening walls.

Thermosympathetic: Thermosympathetic sense allows you to detect warm bodies and fires. Creatures do not normally possess a Thermosympathetic sense.

Undead: +1 Stealth.

Not On Fire: +2 Stealth.

Distance: +1 Stealth for being 15m or more away, +2 Stealth instead for being 60m or more away, or +3 Stealth for being 1 km or more away.

Any Sense: The following modifiers apply to all senses.

Running: -1 Stealth if you Run on your turn.

Attacking: -1 Stealth if you attack on your turn.

Attacking Target: -1 Stealth against the target you attack.