To improve the object must have: God Magic Crystal
Which you can get from tasks, quests, events, or after killing "Predator".
god magic crystal is added, depending on luck of from 1% to 2%
mlvl - magic level
cas - club, axe, sword, dist -distance
every item you can attach 7 god magic crystal.
Remember, you can not use it on:
items, which do not have defense/attack.