Warlord Zaela. The Molten Core is a level 60 raid dungeon located within Blackrock Mountain, home to Ragnaros the Firelord. It was one of two forty (40) player raid dungeons available upon release of World of Warcraft, the other being Onyxia's Lair.he Molten Core in the TCG. The Molten Core consists of rock and lava, with the lava forming rivers, small lakes and lavafalls. Other features are small volcano-like smoke vents, molten cracks in the walls and roof, occasional dark iron deposits, and the runes of warding.