Combat Skill (CS) is a measure of combat ability, weapon strength, and all-around battle prowess. The higher a character's Combat Skill, the more dangerous they are in a fight. Combat Skill can be raised and lowered a variety of ways, including:

Combat are determined by die rolls and a simple comparison of the player's CS value and the opponent's CS value via subtraction (player's CS - opponent's CS).

Note that the player is at a considerable advantage in fights when facing opponents with similar Combat Skill. Lone Wolf only starts losing more endurance points than his opponent at -5 combat ratio or worse, while the combat ratio must be -7 or worse for Grand Master to be at the same disadvantage. However, it is generally hard to recover EP during a story, making attrition a serious obstacle.

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