To improve the object must have: Upgrading Rune
Which you can get from quests, or after killing "Bosses".
Flawless ice crystal is added, depending on luck of from 1% to 2%
hp- life, mp- mana, mlvl - magic level cas - club, axe, sword, fist
shield- shielding dist -distance
every item you can attach 15 Upgrading Rune.
Remember, you can not use it on:
arrow gp's etc items, which do not have defense/attack.