The combat skills of a player character. Intended mainly for a character's self-defence, for the defence of friendly characters, but also innocent and unarmed bystanders (depending on the situation).
Thick as Thieves is a game of stealth, exploration and solving puzzles and small mysteries, a game aout interaction with other characters and the environment, about travel and adventuring. It's a game focused on intelligent, creative and non-violent solutions to problems and obstacles. It is not primarily a game of violence, though every player character also has the ability to defend themselves at their disposal. Players should always remember, that the preferred solutions to a confrontation are always to knock out someone, take them out of the fight, or delay/daze them and then escape. Not killing or gratuitous violence.
The less potential adversaries you kill or seriously injure, the better for you as players. The game will reward more pacifistic approaches to playing through its mechanics of social interaction between characters, through its mechanics concerning character reputation, and so on. In contrast, the mechanics of the game never reward the players, if the players' characters behave like unhinged ruffians.