To solve this design problem, I have introduced something called deadly combat. It works as follows:
- There is a global variable called the deadly combat number. This is 0 at the beginning of each combat.
- Every round that no damage is done, the deadly combat number increases by 1. (To a maximum of 5.)
- All combatants get the deadly combat number as a bonus to both to-hit rolls and damage rolls. Thus, if nobody has been hit for 2 rounds, everybody gets a +2 to-hit bonus and deals 2 extra damage.
- If damage is dealt, the deadly combat number is reduced by 2 at the end of the turn. (To a minimum of 0.)
There is also a skill called "deadlier combat" which, when activated, doubles all deadly combat damage bonuses.