The Combat Value is an attribute of Heroes and Alien Units that determine how many Combat Dice they roll when attacking or defending. Various effects and abilities can modify the Combat Value, but there are never more than five Combat Dice rolled.
Note: no matter how many negative modifiers may apply to the Combat Value in a situation, it can never be reduced to less than 1 (unless the unmodified value is 0, in which case the final value can be 0).
Attack
Attacks in Chronicle X can come in various forms; the main ones are Melee Attacks, Shoot Attacks (of short and long range) and Psychic Attacks. For each type of attack, a Combat Value is determined, first by using the relevant basic stat for the type of attack (usually given by the stat card or board for the attacker), and then by applying any effects and modifiers that apply.
Once the Attack Combat Value has been determined, the attacker then rolls that many Combat Dice -- but never more than five dice. If the attack has a Combat Value higher than five, only five dice are rolled, but for each Combat Value point higher than five, the attacker may convert a BLANK side to a HIT.
Then the defending Combat Value against the attack is determined, and the defender rolls that many Combat Dice -- but never more than five, and no bonus effect applies if the defending Combat Value is higher than five. Then the total number of SHIELDs rolled by the defender cancels out that many non-Critical HITs rolled by the attacker, and then the remaining damage is subtracted from the defender's health.
If the defender's health is reduce to zero or less, the defender is killed, and the Model is taken off the board, and Heroes who kill enemies gain one Experience Point for each Model killed.