Fight the enemies in this bedroom for more plasma ammo and bullets.

Go through this locked (bronze) door. Fight the armours in the next hallway. Find health chalices and missiles.

Then engage in a battle with all the enemies in the green and purple southern rooms. Find more health chalices in both rooms.

Take this cross.

Fight the enemies in this bedroom for the gold key.

Go through this locked (gold) door. Finish with the guards and sub mutants in the veranda and get the silver key, and more health.

Bring down this armour for the brass key. Open the secret door to reveal a death chalice and take on another armour and a ghost.

Continue.