uhm yeah it's not account bound.. it's character bound...
http://www.cabalonline.com/castle/more_02.html
The Mergaheph ring is surrounded in mystery, with rumours stating that it contains the strength of Mergaheph of Tower of Undead B1F. It is a character bound item and is available to be used once per character for the quest.
Level Requirement Above 80Lv (Battle Style Above 9Lv)
Quest Mergaheph's Power Sealed Within
Item Option Critical Rate UP +15%
Critical DMG +1%
Attack UP +1
Magic Attack UP +1
HP +10
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