# The Burning Monolith * Pinnacle Boss: [[The Arbiter of Ash]] Had enough yet? Because there's still just one more thing. The most difficult content in Path of Exile 2. While mapping, you may come across this fortress with a pillar of flame and ash rising from the center, there has emerged from underground, surrounded by an enormous maze riddled with danger. Is the maze preventing something getting in or something getting out? This fortress is of ancient origin, and its construction has similarities to the towers and tablets that you've been using on your journey through the end game. It is clear from the entrance that there are three keys required to enter. Local factions of vying for access to the fortress in order to seize the power they believe will be inside. Each of the factions leaders have managed to get their hands on one of the keys, so you'll need to defeat them. Each faction is led by an Uber Act Boss. You can see one of them inhabiting this city, but in order to fight him, you'll first need to defeat their two lieutenants in the adjacent zones. Boss | Crisis Fragment | Calamity Fragment | Faction Map | Colour - | - | - | - | - [[Count Geonor]] | [[Ancient Crisis Fragment]] | [[Primary Calamity Fragment]] | [[The Iron Citadel]] | Blue [[Jamanra, the Abomination]] | [[Faded Crisis Fragment]] | [[Secondary Calamity Fragment]] | [[The Copper Citadel]] | Orange [[Doryani, Royal Thaumaturge]] | [[Weathered Crisis Fragment]] | [[Tertiary Calamity Fragment]] | [[The Stone Citadel]] | Red