First of all, Warcraft ≠ WoW, and this sword was the sword that Arthas picked up in WC3, that lead him to Northrend where he became the king of the undead. Back in WC3 when you played the undead campaign Arthas would say "Frostmourne hungers" and I just thought it was badass as hell.
Now this (which is actually kinda old but I just came across it):
Blizzard Store
Maybe I'm just a super nerd but I lmao'ed, and am considering getting one to process all those foolish envelopes!
Now this (which is actually kinda old but I just came across it):
Blizzard Store
Never again will you have to worry about unequipping your saronite-reinforced gauntlets to open the mail your postal minions bring you. Wielding this high-quality collectable letter-opener, you'll be able to slice open even the most resistant parcel! The finely-crafted miniature Frostmourne will impress any collector, so get yours before supplies run out. Measuring in at 16 centimeters in length and 3.6 centimeters in width, this legendary letter-opener will make short work of any envelopes foolish enough to fly your way.