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If one of the Runes is wrong you receive the bonuses of the Runes inserted but it does not become a Rune Word. The correct Runes for a formula must be used.So if you have a Mechanic's (or Jewelers item) piece of armor with 2 slots, the Stealth will not work on it because it's magical.
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Again, they will not work on Magic, Set, Unique or Rare items. This means that Set Items, Unique Items, or Magic Items with enough Sockets and the proper item type will not allow or convert to Rune Words.
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The benefits of using a Rune Word is that you can make the Rune Word's magical bonuses apply to any type of item allowed with the proper number of sockets. If the player puts certain combinations of Runes in the correct order into an item with exactly that number of sockets and of the correct item type, the item's name will change into a "unique" name, displayed in gold, and the item will acquire extra powers, depending on the "rune word" that was used.
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