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Vision, Smell, Sound and Light are the key principles to stealth and combat, and can affect how a character is seeing the environment around them, and how hidden a character is from an environment.

These four principles to stealth and detection are highly necessary to remaining hidden and detecting hidden characters.

Vision

Vision is paramount, and is usually the first defence against detecting hidden targets, most creatures with eyes can generally see about 45 degrees ahead of them perfectly well, with their vision on their peripherals being half as effective, some or most creatures have a blind-spot in their vision that can be abused, with a -100% chance to successfully hide in it, this is known as “hiding in plain sight”.

Smell

Smell plays a smaller impact compared to other senses, as smell can dictate the distance that someone is nearby, but not their exact location unless the creature trying to find it has a scent ability. Overpowering smells such as garbage can typically beat smells and trying to find targets or locations using scent.

Sound

Sound impacts a large amount while moving stealthily, while most ears are directional, sound is a way used to pinpoint exact locations of creatures. Sound can be impacted by other, louder noises, such as rain, rendering creatures nearly deaf when heavy rain occurs. Creatures that are not yet seen while loud noises such as rain are in the background gain a +50% bonus to all stealth checks

Light

Light levels play a huge impact in terms of visibility and stealth, with multiple different kinds of light making a different level of effectiveness depending on the location. Usually, brighter lights create less chances to be sneaky, while darkness allows you to not be seen as clearly.

Ultrabright Light

In areas of ultrabright light, creatures can see very clearly, or if they are not used to such light, are partially blinded. A creature takes a -100% to all Stealth actions made while in ultrabright light unless the creature is invisible or hiding behind cover. Reflective and shiny surfaces are hard to read and decipher in ultrabright light.

Bright Light

Bright light is your simple daylight, creatures may be sensitive to such light, but it is very uncommon if so. Creatures take a -50% to all Stealth actions made while in bright light unless the creature is invisible or hiding behind cover.

Dim Light

Dim light is a very neutral form of lighting, while things are slightly harder to read, everyone can see in this form of lighting, such examples of this lighting would be under the shade, in a house in the day where no lights are on, and many other instances.

Darkness

Darkness is what exists when there is no forms of light nearby. Creatures gain a +50% bonus to all Stealth actions made while in darkness, and all attacks automatically receive a 25% miss chance

Ultradarkness

Ultradarkness is where light actively cannot exist, all forms of light are nowhere to be seen. All creatures in ultradarkness are blinded, unless specified otherwise.