It's generally accepted in most every RPG that the undead are weak against fire. It makes sense, since fire beats back the darkness, and also since more corpses are rather dry (go up like Roman Candles).

Really, Link shoulda known that, although to be fair in his universe there isn't a lot of worry about using fire against the dead. Fire kills ice, blue beats red, vice versa. It's a simpler place.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.