Double-Strike Rune

The Double-Strike Rune (倍返しの紋章, Baigeshi no Monshō), localized as Double-Edged Rune in Suikoden V, is a rune which appears in several games of the Suikoden series.

Information
The Double-Strike Rune was a high-risk rune that multiplied both the strength of the rune bearer and their vulnerability to attacks. The rune is most effective when used to overwhelm an opponent, defeating them before they can strike back.