Malfurion's Breach is the entrance point from where the Guardians of Hyjalinvade the Firelands in the area known as the Molten Front. It's here, after securing the area, that Malfurion Stormrage plants a seed that would grow into massive tree, known as a Sentinel Tree,[1][2] that will shelter them and allow them to hold their ground. Once grown this outpost will serve as a permanent shelter for the druids that will be maintained here to watch over the realm, making sure that events like that happening now will not happen again.[2]
After the tree has grown for a time, the surrounding area starts to fill with life as grass begins to grow. Nearby to the west a moonwell has been constructed, just needing water from the Well of Eternity. After completing the quest [35] Filling the Moonwell, it is filled and some fruit plants blessed by Elune grow nearby. As the player character continues to finish the story the several phasing areas begin to appear, such as the lush green grass and the moonwell, along with the Sentinel Tree as it grows larger and larger, allowing the druids to nourish and thrive better in the fire plane.
The portal between Azeroth and the elmental plane is found here.
This area is considered a sanctuary, preventing Alliance and Horde combating with each other, but only in this area, the rest of Molten Front is free game.