confirmed(imo) luck serverside
Well I've found now many a way to add the luck stat.. Buffs, potions, items, even with transformation... Every other stat I add in these ways has an effect in game (most easily testable is atk speed)... EXCEPT luck.. Therefore I conclude that there is some kind of server side check for luck.
Also I think ATT and MATT are server sided also..
Edit-
In fact the only things I can REALLY confirm as 100% working are attack speed, hp, sp. And I'm almost positive DEF is working. I set my hp/def to 1million and am sitting at Klaus on hard while he is hitting me barely making a dent at all. On macha also.. He is hitting me from 400-1k...
Another thing confirmed to work is attack range.
I've since confirmed STR, DEX, INT, WILL, are all serversided and mods of such will be only visual.