A warning

[fearinahandfulof]

There's something wrong with the room with the door that isn't quite there. I get a very strong sense of foreboding from it, like it's a bad omen. It doesn't belong.

The Mood Ring game from the last Liminal was the same way.

[several hours after Cassandra's post]

[willyousee]

[Alcuin's voice is full of an icy fury that he's trying, and failing, to conceal.]

Avoid the color shifting rooms at all costs. If color magic is used there, all surfaces immediately shift to the matching color and lock into place, opening an adjoining adjustable chamber. In addition, all color magic of that color used in that room is doubled, at the very least. Thorne and I have both tested this.
Unfortunately, [spoken as though through gritted teeth] even destroying the contents lasts for no longer than the space of a blink. The Illuminants' influence is upon that place, and likely whatever poor, unfortunate world we next visit.

Which brings me to my next point:
Should you see anyone dressed solely in a single color, even if they are different hues, be extremely cautious of them. They are likely to be a powerful mage perhaps nearing the power of our patrons. They displayed themselves as weaker before, but depending on the timeline it is possible that now they are a great deal stronger.

There are eight of them: Red, Orange, Yellow, Green, Blue, Indigo, Violet, Rose.
Each has a different theme, and different emotions which govern their actions. Each has a positive and a negative aspect. I strongly suggest entering the Library tower and ascending to the first floor. On the shelves immediately to the right of the door on the lowest shelf are several treatises on Color Magic, the Illuminants, and the world in which we have encountered them. I have been host for the Yellow Illuminant twice now. I will eagerly answer any questions you might have.