No longer available to players due to quests being marked as obsolete in Cataclysm. The sword's name is a reference to Link's (of Legend of Zelda franchise fame) Master Sword. Quite a shame considering its clean, bold lines.
Like many weapons, it was changed from main hand to one-hand for easier transmogrification. Perhaps the closest similar item that is still obtainable is www.wowdb.com/items/15214-nobles-brand. It has the same design on the hilt and blade, but the blade itself is much slimmer.