Cool (Cl) represents a creature's ability to remain calm, collected - even sane - under severe psychological stress.
Some of the creatures that inhabit the Old World are truly frightening and may be confronted safely only by characters with a high Cl value.
Cl is expressed as a percentage of 01-100%.
For tests, Cl determines a character's natural bravery and resistance to shocks, unpleasant sights, hopeless circumstances, deadly danger, etc.