Logic of Enchanting
In my opinion it can be setup from 1% safe or 0% to 100%,depends of server.Who administered.Now you have to play with that server.
100% - no risk,chance,luck....
20% - 80% risk and 20% luck,chance. 80%-20%=60% risk
Formula:
a%-b%=b%-c%=d%
Theories:
1# pvp+farm=bonus % enchant
2# enchant 3 or more (1'am+1 ,2'am+2 ,3'am+3) ->->->Enchant->->-> (1'am+5 ,2'am+7 ,3'am+4) ->->-> keep y'am+7 don't enchant ->->-> (1'am+5 ,3'am+4)->->-> enchant until make +7 and then ->->-> (1'am+5 - +6 ,2'am+7 ,3'am+7) ->->->Enchant until 2'am+, 3'am+ 1 of those will failed. Buy new am and enchant until get + at own am from your first enchant,then enchant both until one broke. Repete this until max enchant.
am=arcana mage
1'am+5=failed
1',2',3'=first,second,third "item"
.....more ways.....