This immediate area has pyre saurians so be careful. Proceed to the main hall to fight some humanoid enemies. To the south corridor you'll find the Void Key, beside a corpse. After picking it up, a rotten dragon will appear. If you're a ranged attacker, you may consider going to the second floor and jumping on the ledge nearest to the porch. This will limit the dragon's movement to simply flying under the porch or above the ceiling, without posing too much damage to you. When the dragon is almost dead, you may consider equipping non-dragonforged equipment you have and wear them if possible.
Head to the northern corridor to find another tablet piece. Examine it to obtain the recollection of another arisen. Go behind the burning barricade and climb the blocks to reach the second floor. Loot the chest there and continue up to find a macabre statue. You can now exit and leave this area.
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