I've been thinking about bonuses to the attack and defense attributes similar to intellect and here are some ideas.
I'll use TL values as the initial starting values and may use the same for AP / CW - we'll see.
For attack, every 7 points increases a unit's base critical hit chance (krit) by 1% (this is additive, so if you have 7 attack and the unit's krit is 5 then it will be 6 or if the unit's krit is 15 it will be 16). For every 15 points maximum damage possible increases 100%. Note that the maximum damage is actually only 200% right now (see my forum topic
here). So if you have 15 attack, then you'll be able to do a maximum of 300% damage instead of 200%.
For defense, every 7 points increases a unit's resistance to all damage types by 1% (once again additive so if a unit has 0% resistance, it will then have 1%). For every 15 points, the damage reduction decreases by the next integral value. So for example, damage reduction is limited to 1/3 (33%), if you have 15 defense then damage reduction is 1/4 (25%), for 30 it is 1/5(20%), etc.
This will encourage getting higher attack / defense values if you are a Warrior / Paladin due to the increased krit / maximum damage and increased resistance / damage reduction.
The values are probably going to be my first cut for now, but we can always update them if these initial values prove to be not right (i.e. maybe for every 15 attack the bonus is +50% instead of +100%, etc.).
/C\/C\