Call of Cthulhu d100
For the sake of your investigators, it may be better to avoid confrontations with the horrors of the Mythos. However, your investigators won’t always have a choice in the matter, and at times they will have no other option than to fight. Combat is handled in a simple manner. To begin with, combat is divided into rounds. A round lasts until everyone has taken an action, and is vaguely defined in-game as “long enough for everyone to do one or two interesting things”. The order of combat is determined by DEX scores: highest DEX score goes first. When it is your turn to attack, choose a target and roll for a check corresponding to your kind of attack. Succeeding in the check means your character has hit their target, and dealt damage fitting the type of weapon they are using. Melee attacks also factor in your character’s damage bonus, increasing or decreasing the damage dealt as appropriate.
Sometimes the target may have armor or some other form of protection from damage. This is rare for investigators in early settings such as the 1920’s era, but you may still encounter foes possessing such defenses. The damage prevented by the armor is simply subtracted from the damage value at the end of the calculation.
If your investigator’s HP drops to 2 or less, he/she falls unconscious. If it drops to -2 or less, then the investigator dies.