Guess what? The prosthesis of truth now contains the lair's map!
For a long time, I was wondering whether or not I should add a map to the game. I thought it might become too easy since the lair disposition is pretty simple when seen from far away. A compromise was made, the map was kept to strict minimum and does not show the player position.
Hardmode fix
fix for a starting a new game in hard mode which could previously fail