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I realise now that the two doors you are asking about are the two shops. To open these doors you need to return Alkem (the owner of the tower) his ring. He's on the second floor of the tower and is the guy who gave you the key to the crypt.
In the Crypt, to the far north there are two switches that activate two teleporters in the central room. Enter one of the teleporters and get transported to a corridor. Follow it and find a wall switch you should press. Return to the central room by another teleporter at the end of the corridor. From the central room go through one of the middle doors to the north and find a door to the far north of the passage behind. You'll see a large coffin and in one corner of the room, buried in the dust you'll find the ring of Alkem.
There is a big fight, you then return the ring to Alkem who opens up two shops in the basement of the tower. In the potion shop you need to buy an empty flask.
To find the ingredients to put in the flask you need to go to the Temple of Gala, Goddess of Life. You find the temple near the east coast of the island in the mountains enclosing the Hoimon desert.
If you've not done the Temple of Gala then I probably should shut up now.
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