SuikodenEdit

A rune that allows it user to attack two different targets per turn in a single round, but if they're countered the damage they'll receive will be doubled. If there's only one enemy left, it does nothing. Eikei has the game's only Double Beat rune when he joins and it can be removed to give to another ally. 

Suikoden IIEdit

The Double Beat Rune fulfills the same function it did in the first game and in Suikoden II, it allows the rune bearer to hit the same enemy twice.