Firelands is a raid instance, released with Patch 4.2.0 on June 28, 2011. It can be entered through Sulfuron Spire in Mount Hyjal. It is a domain ofRagnaros the Firelord, from where he endlessly sends his elemental and mortal minions in order to fulfill his ultimate goal of destroying Nordrassil.
The raid consists of 8 bosses (one only accessible through the legendary quest chain), as well as outdoor and indoor environments. It is intended to be one grade in difficulty above raids implemented at release of Cataclysm, just as Ulduar was in Wrath of the Lich King.
Elemental Plane (access locations in Mount Hyjal)
Avengers of Hyjal
The ash-choked Firelands is the least hospitable of the elemental domains. What serves as air in this harsh place is laden with scalding, noxious fumes. The only safe havens from the Firelands' ever-churning magma ocean are islands of jagged rock. Yet even the dangers of this merciless landscape pale in comparison to the raging fury of the elementals who dwell there.
For ages, the Elemental Plane served its purpose as a secure realm to imprison Azeroth's primordial spirits... until the Cataclysm ruptured its boundaries. Without warning, Ragnaros's armies surged toward Mount Hyjal, intent on burning the World Tree of Nordrassil to the ground. In the ensuing conflict, many brave heroes gave their lives to protect Hyjal from destruction. By their noble sacrifices, the impossible was achieved: the Guardians of Hyjal pushed Ragnaros's minions back into the Firelands.
Now, the battle to protect Hyjal rages in Ragnaros's smoldering realm. As territory is gained and Azeroth's champions edge closer to the Firelands' inner sanctums, a monumental task lies ahead. Entrenched around Ragnaros's lair -- Sulfuron Keep -- are his most trusted guardians, including the turncoat Druids of the Flame and their mysterious leader. Yet Hyjal's defenders cannot afford to shy away from any of these dangers. Should Ragnaros prevail against the incursion and succeed in destroying Nordrassil, Azeroth will suffer a blow from which it might never recover.
The Firelands is the molten domain forged by the titans to house Ragnaros and his wayward minions. Following Deathwing's emergence into Azeroth, Ragnaros and his servants surged onto the slopes of Mount Hyjal before being driven back by the sacred mountain's valiant defenders. Now Ragnaros is rallying his loyalists to defend the Firelands from Azeroth's champions.
How do I get to Firelands?
Firelands entrance is located in Mount Hyjal in Kalimdor. You can grab the portal or a free ride there from your capital city. The entrance is located in Sulfuron Spire, the giant lava lake on the south part of the map.