From the introduction: Combat in d6 RPG is just another form of Success Test with an unmodified success level (SL) of [12] on 2D6. Character’s can use whichever attribute bonus is appropriate for the attack though agility is the most common. A character can have varying levels of success in their attack from obliterating their opponent in a single shot to permanently injuring their comrades. User summary: Document adds optional rules to the game for fumble and critical hit results. Includes random tables for both.