Raise the level of equipment by one level (for example, turn ordinary equipment into extended equipment and turn extended equipment into elite equipment).

Upgrade object

It can only be yellow or dark gold equipment (of course, necklaces, amulets, rings and jewels have no concept of hierarchy, so there is no concept of upgrading).

Upgrade operation

Improve the basic attributes, others are completely unaffected. What are the basic attributes? Just remember that the basic attribute of armor is defense, and the basic attribute of weapons is attack power, as well as their respective needs (agility, strength, level). In other words, only increase the defense or attack power, and at the same time, it will definitely raise the requirements more or less.