My old topic (http://www.gamefaqs.com/boards/642453-ragnarok-odyssey/64001823) got archived and no one answered it but I just wanted to say that weapons without rune can skill change or level up, too. It occured at +9 to +10 but I think it works like the "other" runes.
hello roksu, i have a muramasa.. its an epic weapon. can skill change may occur if irefine this item? thank you :)
If it has a skill that can level up or modified, sure. Not sure about exclusive skills, though. I guess Muramasa can skill change/level up but I'm not sure at what refine level it starts. I tried on one runeless weapon and it skill leveled up at refine level +9 to +10.