All enemies are dead. Boss dead. I m taking sword, talking to Miridia and falling causes death. Door in room that contains sword is "closed with a key".

Is there a manipulations that can solve this bug?

Do you have installed the skyrim Unofficial patch ???

Do you have any mod's installed ???

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When you hang in the sky while talking to Meridia, she may suddenly drop you and you die when you hit the ground before the teleportation triggers.

• This bug is fixed by version 1.3.2 of the Unofficial Skyrim Patch.
• This is often caused by carrying too much weight. Try dropping a few things before taking the sword.
• Walk towards Meridia as soon as she has lifted you into the sky, thereby dropping onto the area at the base of the statue instead of a longer drop further back.
• Skip through the dialogue with her and you will be able to adjust your position before the fall begins. You need to land on the upper area of her pedestal.

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If Malkoran is dead somohow before you reach the last chamber, you should just reload a previous save. !!!!