They are not arcane runes but more a religious runes. Although Asmodeus is planar entity he is also a god. However with Linquistic roll you could determine their generic meaning (a somekind oath writing or religious ritual purpose). But your +1 modifier and can't make linquistic check untrained you would not figure it that way either :P.<br/><br/>Also knowing infernal would allow you read the script plainly (even if not sure of meaning of the oath nor know Asmodeus besides his name and generic data). But you know abyssal only so that neither works. So very best you can tell it's somekind writing but cannot understand it.