Quote Originally Posted by Onolock View Post
On release, Molten Core and Onyxia's Lair were the only 40 man instances in the game, thus Ragnaros was the first "game end boss." source http://www.wowwiki.com/Molten_Core

Fun fact, it was. Also WoW lasted a lot longer leveling wise and gearing up to even get into MC. Where as FFXIV you could level and gear up in a week and walk into Coil.
I wouldn't really say it lasted much longer, most MC bosses were killed in January of 2005 which is about 1-2 month after release. Ragnaros was the only exception being 4-5 months after release and I think that had to do with farming a full FR set was a nightmare at the time.