You cannot repair ethereal armor. Armor refers to any sort of armor, including helms, boots, belts, gloves and shields, not just body armor.
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2. Charged Items Guide
A Charged Item allows a player to use various spells that may not normally be available to a character class.
These items are called “Charged” because they allow the player only a limited number of uses of the spell (charges).
Once the charges run out on the item, the player will be unable to cast the charged spell again until the item is recharged. This can be accomplished simply by visiting a repair vendor in town and having the item repaired as normal.
Charged Items can spawn with varying spell levels and number of charges.
3. Determine the Required Item Level for a given Skill Level of the Charges
Skill Level N = R + (T*N)
R = The level required to use the Skill for its own class (For example: Inner Sight=1, Lightning Strike=30)
T = (99 – R) / M (rounded down)
M = The intended maximum Skill Level for the Charged Spell (Refer to the Affix List for this number)
Example: Amulet of Teleportation
R = 18
M = 3
T = (99 – 18) / 3 = 27
Skill Level 1 = 18 + (27*1) = Item Level 45
Skill Level 2 = 18 + (27*2) = Item Level 72
Skill Level 3 = 18 + (27*3) = Item Level 99
4. Determine the Maximum Number of Charges
Charges = B + (B*S) / 8 (rounded down)
S = The Skill Level of the Charged Spell
B = The Base number of charges on the item (Refer to the Affix List for this number)