Woke up with this and am now intrigued and curious
oh boy do i have the time to fully tackle this rn (i am like. supposed to study. but anyway-)
multiversal madness is akin to you losing your mind because of eldritch/cosmic knowledge and yada yada. not the same but similar.
it can manifest in maaany ways, but im gonna take myself as an example : tldr going in contact with the multiverse made me lose my mind and kill people. for others it can be triggered by the concept that there's multiple of your selves, or well in general the whole knowledge of alternate universes existing can drive someone mad or mentally ill.
usually it happens with people originating from lower dimensions getting in contact with higher ones (the multiverse is the 5th dimension and forward. usually people born on the 4th dimension (like you and me for example) are only used to that and "understanding"/getting in contact with higher dimensions might be too much information for one's mind of that level etc etc)
counterexample : gods whose physiology and mind are *made* of multiple dimensions are immune to multiversal madness, of at least the dimensions of their origins.
tldr, someone existing in the 6th dimension will be fine knowing about the dimensions from 0(?) to 6 etc. (im saying that as i have roomates who are gods and are VERY unphased of having doubles because... they exist in multiple timelines at the same time. yes even irl timelines. its weird. while you and me exist in one at the time. the rest of "us" in divergent timelines being different people and our minds are not connected to them, etc.)
its like saying that a square, exists only in the 2nd dimension. if you duplicate it and move the duplicate aside thats now two different ones, not the same but displaced. but if those are *connected* they now exist in 2 universes of the 2nd dimension and are their own entity existing in two 2 dimensional places, aka in the 3rd dimension. idfk if im making sense tbh lmao? but like yeah, a cube, to *exist* and be functional etc, *must* exist in multiple 2d planes, each plane containing different data of the cube. but the cube exists in like x amount of 2d planes, but a square in one of the cubes planes would only be able to see a slice of said plane. thats how i see the gods in my head lmao, their physical visible form is only a fraction of their existence as an entity.
anyway that aside. basically the "mortal mind" (or well. the 3-4th dimensional mind), cant deal very well with knowledge beyond its scope. dont get me wrong some people are not. *that* afflicted with multiversal madness. but yeah it depends on how you have been exposed to the concept tbh. but tbh the ones that are not affected are simply the ones not thinking about it lol <///3.
so it really stems from being suddenly able to see something you shouldnt see. for me it mostly happened when i got corrupted and when i was able to move in the... 5th dimension i think? yeah. and also when i was able to see the fabric of a universe i am in (aka the code). actually i think im technically able to move through more dimensions than that- but i am not able to see them as a *whole" ykwim? its like, if a square was suddenly able to move 2d planes. it is *still made of 2d data*, but suddenly it can change universes and move through them. but it us unable to see or comprehend the full 3d world, ykwim? for me it feels mostly like as if i am moving but blind. i cant just see the multiverse all at once like the gods can, i can see one "plane" at a time and such. so yeah i basically dipped a finger in concepts beyond what my sanity could handle and went mad from it <3333 normal stuff yk lmao/silly
so yeah uh, idk if i explained it right or cleanly? but if you have any follow up questions please let me know./gen