Dear players, please remember that items have chance to be destroyed during upgrade or refine.
You can get great power from more slots but in same time you take a risk when upgrading it. Chance of destroying item is part of gameplay and won't be removed from game mechanic.
Stones from normal bag can destroy items in slots (clear other stones) or destroy whole item.
Items from chantra bag (like wings, cloacks) has no effect for destroying.
Destroyed items can not be refunded.