I don't recall this being asked before, so I'll ask now:
Is there a reason the "妖器" in Dark Spark is listed as "??" on the wiki, aside from having more than a few meanings? I can see why it would be left as that in the case a precise title can't be decided upon, although there are rather different, multiple translations for other spell cards as well, such as Orreries Universe's title being either Ritualic Space or Astronomical Instrument.
EDIT: ...Odd, it's apparently translated (as "Bewitched Weapon") in the translation page for the game, but not on the character profiles for all three of Reimu, Marisa and Sakuya.