The map starts at a corridor containing a few spiders, has an archer around the corner, and leads to the throne room (which has a golem).
Continue to the next corridor, leading to an archer and golem pair, and a few other enemies in the next room. There is a pool in the middle of the room containing an invisibility sphere. Exiting the pool is more difficult than usual, to climb out, start at the bottom of the pool, and use the swim up command (default:) while trying to move forward. It is also possible to use a chaos device to escape.