There’s been a lot of confusion about Shaiya luck lately among people I’ve talked to. I’ve tested with luck a lot and have been part of numerous forum discussions lately regarding it. This is the best theory I (or anyone else) can come up with regarding luck damage.

I’m doing this from a physical damage point of view but it holds true for magic damage. Just replace ATK with magic attack, strength with int, and defense with resist - Although I think 1 resist drops magic damage 2 points.

First… let’s look at a regular hit that doesn’t critical. Here’s the best formula I can come up with…
[(ATK+special attack damage)*elemental factor - target's defense] = damage dealt

Here’s a description of all the factors that come into play Shaiya Gold game…

Elemental factor is either .5, .75, 1, 1.25, or 1.5 depending on the situation
.5 = using your water epic on an earth mob
.75 = using a regular weapon on an earth mob
1.0 = using water epic on water or wind mob or non-ele on non-ele mob
1.25 - using water epic on regular mob
1.5 = using water epic on fire mob

ATK = your attack. For most classes, this is your strength times 1.3 plus your dex times .2 plus your weapon damage (including assault lapis and the like). For magic users it’s 1.3 times int +.2(wis). It’s also different for archers using a bow, 1*str + .2+dex+.3+luck .

Special attack damage = damage from Shaiya Gold skills. Demon hushing, magic spot, and Turbulance are all skills with special attack damage. It also includes buffs like support spell and leadership.

Target’s defense = fairly self explanatory. Resists for casters (times 2 I think).

Finally, if your normal damage would be mathematically zero, the Shaiya Gold game lets you hit for a random amount between 1 and 10. Like if an int mage melees a rec defender and hits, he’ll still hit for 1-10 damage.

Okay, now let’s look at crit damage. I assume you know about crit rate.

Crit damage, to the best of my knowledge and tests, is equal to the following…

1.5*[(ATK+special attack damage)*elemental factor - target's defense]+(your luck)(a random number between 0 and 1.5)