I originally used Mysteltain as a user name, which was the name of this pretty badass looking weapon in Ragnarok Online (it was basically a black seven-branched sword) and because I thought its description was cool. It was something along the lines of: "This cursed sword slew Baldur, the god of light. It grants the wielder-" some effect that I can't remember. Strangely enough, I never played any class that could use the weapon. But then again, I've always enjoyed collecting rare items, and to get the sword you had to go through a quest to access the quest for it, which required a crap ton of materials to make. No way I could resist that sort of timesink!
Anyway, it wasn't until later that I finally did some research and found out the proper spelling for it--or at least one of the English variations on it--which is what I'm using here. At that same time I kinda figured out that it essentially means 'mistletoe', and I kinda had one of those, "Oh...it sounds a lot less cool..." moments. Still, I'm a big fan of Norse mythology, and I like the story behind it (which is basically how Ragnarok began).