I will tell you exactly how LUC is working
LUC is a Stat that does not Affect Enchant success Rate
LUC is a separate stat That has a Chance to Proc in every enchanting system (No compound), It means that more LUC you have, More chance you have to proc The Green leaf above you'r head
Even though you'r enchant sucess or fail, LUC can proc at any time, its the reason why it also proc when there is 100% success rate aka on +1-3 weapons etc
By exemple: You have 50 LUC, it's low , u will maybe proc the green leaf once out of 20 enchant, More LUC u have more % chance the green leaf can proc
The Best Number to get nowadays is approximately 90, i believe the cap is around that, i personally reach 100-110 LUC but doesn't see much difference than having 90
Let's say with 90 LUC u have a 15% chance to proc it ( there is no Exact Data and % rate posted officially) if you enchant a Dragon shirt +5 to +6 which has a base of (10% success rate) and u separately add (15% from LUC), u have more chance to success ur enchanting from LUC than actually succeed it from the enchant success rate. but Both stat does not stack, u don't have 10+15% togheter, u can succeed the 10% and still proc LUC, with 10% chance u have a big chance to fail this is why LUC matter so much, it's like a second chance, and that's how people managed to get their shiny shirt +10 in past, nowadays +7 dragon shirts,bracelet ...
I've been using 90+ LUC everytime i enchant something and its clearly a MUST to have, otherwise you will most likely lose ur money
annother exemple: Radiant circlet enchant from +4 to +5 is 15% success rate, with 90+ luc, u have annother 15% chance to proc it, it means clearly that u have alot more chance than someone without LUC to succeed, and personally at very low success rate most successfull enchant comes from LUC.
I hope that was clear enough
ITEMS TO GET LUC: Hat +3 LUC / 6 slot brooch +2 LUC / Venir 17+ +2 LUC / Insanity +2 LUC / Ruler ring +2 LUC / Truth seeker ring +2 LUC / Gods ring or dragon ring +3+ LUC / dragon neck earring +3 LUC / Nevit cloak of light +3 LUC or castle cloak for elite member +2 LUC / Dragon shirt +5-7 LUC depend stage and enchant / lvl 3 artifact +1 LUC / Greater emerald +3 LUC / Dark Beer +3 LUC / Nano pots +6 LUC / Brilliant rose +2 LUC / +15 LUC Dye / weapon augmenting +1-2+ LUC / Exalted passive +3 LUc / Fortune seeker passive +3 LUC / honey vit beer +3 LUC stage 3 / NPC buff at giran-aden church +1-3 LUC
im probably missing some items but mostly those items will boost ur LUC.