Thanks a lot Aelis, this is very interesting.
I wanted to throw in some more candies for the mind but it seems I lost access to some parts of the forums. Therefore, I can only share the crumbs I noted down in my docs, with no links for validation.
Sadly, I can't always discriminate what's been taken from official sources and my speculations around them.
The traveler is a "reverser", I don't have a better name for it yet but there are symbols that counter another and a third type of symbols that can double or reverse an other, thats the traveler, not shade, not angien, yet causes the apparition of a tainted angien. Some of you provided essential explanations to the key question I asked, but the mystery is still open. Question was: "what do you add to something to obtain its opposite?" (I'm pretty sure this comes from Mur)
At first I thought the answer to this last question was the 0 point, the gap that opens a circle (see attachment) and might create two different directions/poles.
From a mathematical point of view, the answer would be different. The question can be put as:
A (something) + X = -A (opposite of A)
Therefore, X = -2A
Which symbol can double AND reverse?
This is a very strong image.
I had it noted down with a couple of considerations that enhance its "timeless" connotation:
A prism divides light into colors and narrow their number to those we can perceive.
A cube (our mind) divides existence into a series of temporal actions.
For an insignificant moment in time the sphere was the shades view on the movement of all cubes.
The Angiens have a religious feeling. [...] The Angiens are the answer, but the fun part is that the Angiens are actually the QUESTION. (Again, I think this comes from Mur)
In a religious system, the untouchable answer (God) is fueled by the constantly moving herd of worshippers (the question). Angiens seems to be both in AND out of MD, in and out of duality.
The one opening MD box can be seen like the 3rd observer, the one outside duality, the gap in the circle... God? Our Demon of the East in Angien's disguise?
One last thought that haunts me: compare the research clues about Angiens ("burning ability" in particular) and "page 5: a deadly secret", from Chronicles of a Shade killer. 🙃