Environment
Characters and living entities have a required Environment. These are a list of conditions that entity needs to live. If they are not fulfilled by a combination of the environment, dress, and inventory, the entity must make a save vs. Instadeath every combat round or turn. If they fail, they fall unconscious and lose 1d4 hitpoints per turn until they are in a complete environment.
Surface and Facility maps also have an environment. Their environmental qualities are listed for matching with entities, but map environments have a number of extra features as well.
Traits: List of environment qualities to match with entities.
Hexes: The types of hexes this map may have, plus descriptions of any effects they may have.
Features: Descriptions of the types of physical features that may be discovered.
Linear Features: Similar to above, but these features lie along hex borders and can continue for long distances.
Rarities: When exploring and searching hexes, these rarities should be used when rolling for the presence of features, encounters, and other special occasions. A feature roll or encounter roll is simply a roll on the generic rarity table. The feature exists/the encounter triggers if the roll is in the rarity category specified.
A table below gives the rarities for different kinds of encounter or feature. If the feature/encounter roll succeeds, roll on these tables to determine exactly what or who has been discovered.