I haven't played since the Arthas expansion.
Before that I had, 2 level 60 hunters, 2 level 70 hunters, 5 level 70 shamans, 1 level 60 shaman, 2 level 68 shamans, 2 level 60 druids, 2 level 60 rogues 1 level 70 rogue, 1 level 60 warrior, 1 level 70 priest, 1 level 70 Paladin (friend plays it now, it is one of the most famous in the game, has Arthas orange sword) and a level 80 dk.
My M.O was to power level, or eventually quad or 5 box a group to cap and then quit ;p
It's Shadowmourne, not Frostmourne. Arthas' sword would drive you insane and probably turn you into the new Lich King. Not much cop for a player, really.