In the rule Ritual Chambers, add the following to the end of the first paragraph:

The Ritual Chamber located at A1 is called the Yellow Bile Chamber. The Ritual Chamber located at A8 is called the Black Bile Chamber. The Ritual Chamber located at H1 is called the Blood Chamber. The Ritual Chamber located at H8 is called the Phlegm Chamber. Richardo von Nestor may set these Chambers to have any Description that he wishes.

In the same room, as a third paragraph, add

Richardo von Nestor may not move to a Ritual Chamber through the use of a Secret Passage Map, and all Ritual Chambers must be omitted from the secret random selection that takes place as a result of the use of that item.

In the rule Ritual Chambers change “random room” and “random Non-Ritual Chamber” to “random Ordinary Room”, and in the rule “Run Initialisation” after the text “and is not orthogonally adjacent to Richardo’s starting location” add “and is not a Ritual Chamber”. In the same rule, in the sentence “then a random non-Ritual Chamber gains the following Effect”, change Effect to Feature.