"You get the password to enter the tower from an outdoor special encounter behind a hidden passage to the east of the Tower of Magi."
....where is this hidden passage? I'm stupid, I'm afraid, I've been looking and looking but can't find it. I've mentioned "haakai" to Kelner, and he mentions that Solberg left instructions in the hidden cave to the east of the tower of the magi, but I can't find that cave.