KMST 1.2.460 - Xenon

They are all primary stats so 1 STR = 1 DEX = 1 LUK.

Unconfirmed, but likely the case. Can not immediately assume this to be the case for its damage formula.

You need 260 of each for Multilateral V (which you could probably just get from +all stat equips) but otherwise you could pump into one stat.

Not true. Requires 260 AP of each. See below"

Orange Mushroom has the details on Xenon's skills up.

So the way the Stance, Resist, and Avoid works is that there are five different passives, and they give you 10% of them for each of the stats above a certain amount, having all three stats above the amount gives 10% damage, and the description outright mentions AP instead of just having the stats.

So it looks like all three stats is the way to go. 260 in each stat for 50% Stance, 50% Resist, 50% Avoid, and 50% damage is too good to pass up.

Though I don't quite see the five passives....

Hadriel