The Blazing Fortress can be accessed after the player has attained Combat Level V by using the Launch Pad found near the top of Spider's Den. This will take the player to a different sub-server containing the Blazing Fortress.
Outside of the fortress, there is mineable Netherrack. To the left of the entrance there is a mine full of Glowstone and Nether Quartz Ore, along with Pigman. To the right of the entrance there is a small area where Blazes spawn.
Walk down the stairs from fortress, you will enter a big bridge area occupied by Magma Cubes. Walk straight and a big stadium area will appear in your sight. The stadium are also filled not only with magma cubes but also Ghasts that roam around the sky at night.