The order of the calculation is very important here.
1. Determine if you actually hit the target
2. If yes, then determine if the hit was a critical hit.
3. If yes, calculate the critical hit bonus:
Bonus = LUC*(Random number between 0 and 1.5) - (Armor Enchant) - (Lapis Absorb)
The Bonus can be either positive or negative
Here is where the tricky part comes in:
If the Bonus is positive, then the that value is scored as direct damage to the target.
If the Bonus is negative, then that is carried over to the based damage equation.
To simplify this, we will call the remaining bonus Residual_Absorb
Residual_Absorb = 0 if Bonus > 0
Residual_Absorb = Abs(Bonus) if Bonus <=0
4. Calculate base damage
Base Damage = (Attack - Defense)*Ele*C1 - Residual_Absorb
C1 = 1.0 for not Crit Hit, C1 = 1.5 for Crit Hit
Ele = elemental damage, value varies depending on ele vs ele in weapon and armor.
Absorb is computed first. Depending on your target's absorb and your LUC, there may be zero damage to the target for every critical hit.
You need LUC to get the critical hits to maximize the base damage. But the direct damage due to the LUC bonus is heavily affected by the Absorb.
This is one of the biggest things that nerfed that archer class. When EP 5 came into play.
Right now it is hard to say how LUC will play with the new High Def armors. If someone has 1000 LUC, the average LUC bonus will be 750 (a range from 0 to 1500). The lvl 7 absorb lapis is already in the game at 100 Absorb a piece. If the target has 4 of them, that is 400 off the 750 for a remainder of 350 average LUC bonus damage. the lvl 8 and 9 absorb have 150 and 200 absorb respectively. The lvl 8 absorb will be AP items in tiered events very soon. Well three of those will will absorb another 450 points. Hence with a few lapis, a target can completely negate any special damage that an archer could deliver.
Then because the archer has put so much of the stats in LUC, their base attack is pathetically low, thus the targets base defense overwhelms all/most of the attack power of the archer. Hence, archers are nerfed even more with the new armors.
If Nexon doesn't fix this, then archers will remain a novelty class for the few people that want to endure the pain of leveling slowly because the majority of the community doesn't want to party archers because they already know they have an extremely low DPS.
Archers should not be an AOE class, but they should be deadly in the one on one fight.
I will continue to play my archers to the very end. I enjoy the class, but wish it was a bit more effective