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Given by its name this is an effect rune with double-edged power. It increases both the damage dealt and received by physical attacks of the wielder. If you are already packed with heavy armor you can easily accept the drawback and use this rune.
It has its appearance in several games, mostly looted from enemies and sometimes even sold in rune shops. While the damage was increased by 50% in Suikoden II, this rune was strengthened up to double damage thereafter. - Celes