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, and another +1 Stealth for every 4 times that distance.

Auditory: Hear vibrations. It does not function in a vacuum.

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

Distance: +1 Stealth for being 10m or more away, +2 Stealth instead for being 40m or more away, and another +1 Stealth for every 4 times that distance.

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, and another +1 Stealth for every 4 times that distance.

Any Sense: The following modifiers apply to all senses.

Heavy exertion: -1 Stealth while Running or jumping.

Attacking: -1 Stealth while attacking.

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