Activate the elevator

To activate the elevator, separate one person from your group to go to the left just before entering the tower. You have a path of jumps to achieve, preferably take a character with strength to jump as far as possible. Once you have bypassed the tower through the left, collect the blue plant "susureau flower" in your inventory, then go to the door just behind you. Go find the generator and insert the flower through the panel. This will activate the tower including the lamps and the elevator.

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Access the secret floor

You now have access to all levels of the tower, well almost. There remains a level well hidden with the key to a very rare weapon and scrolls. To do this, collect and read the books of all levels, before reaching the last level of the tower where Bernard is located. Reading his books will allow you to interact with the boss, you can even give him a hug. The interesting point is the dialogue where he gives an object, a ring of light that will be right next to him. Equip it on your character and cast the light spell on yourself. Go back to the elevator level and you will see an "up" button appear. Use it to access the secret area, where you will find weapons and scrolls.

You can then either go back through the elevator, or exit through the back door and activate the lever opening the secret passage of the wall.

Obtain the Light of Creation weapon

Once all this work is done, you will have to kill Bernard to retrieve the weapon from his corpse. You can also try to steal it if you don't want to kill it. An easy way to kill him is to push him off the top of the tower while he's still friends with you, but if you want a fair fight I suggest you stand on the thatched roof to the left in order to to be protected from a crush and to be in height. Aim first at Bernard then kill his minions.

Once finished, you can leave the tower!