The Resurrection Rune uses magic of the holy element, so elemental affinities and weaknesses are based off of that. It is highly effective against the undead.
It is a fairly rare rune in the first Suikoden with Fukien being the only character who has it attached upon recruitment. Only one enemy in the game drops the Resurrection Crystal, that being the Whip Wolf which can be found on the field map in the Lorimar region.
In Suikoden II and Suikoden V, the rune is even more rare with a maximum of four being available in the second game through character recruitment, chests and the Guardian Deity statue, and three being available in the fifth game, should you take advantage of every opportunity to find Resurrection Rune pieces.
Both Kahn Marley and Gantetsu wielded this rune with skill during the Dunan Unification War.