Excalibur

Excalibur can be obtained by completing the desert treasure mini game. There's not a lot of point in getting it though, because most people will just complain that you've got a super-powerful swords (it's stats are "off the charts", as the youngsters say) and then whine in your ear until you tell them, for the fourth time, how to get it.

Not that I have anything against new players. ;)