So, the "eldritch truth". I always liked Lovecraftian conceptually and aesthetically, and came across the idea of maddening enlightenment trough bloodborne, which is to say: a truth that, when discovered, would be so deeply upsetting, so impossibly hard to grasp that it would make someone mad.

A lot that powers Lovecraftian aesthetic, at least in my case, is the mystery, and, oftentimes, the impossibility to solve certain things, or the omission of certain mysterious points, that still leaves a drive to "know more" in the reader, to theorize and discover what is concealed. So I began wondering: what would be the "eldritch truth"? What would concretely be a truth that would drive me and everyone else mad?

I began by thinking it would be an explanation on how things work that would be deeply upsetting and trivialize living, like (for example) a confirmation that free will does not exist, and therefore everything that we do, we cannot NOT do.

I also thought that perhaps it would be an unbelievable prophecy, like the inevitable explosion of the earth due to a man shouting too loud, something like being Cassandra, cursed by Apollo to utter true prophecies but never be believed - I though, if I was Cassandra, I'd certainly go mad, and perhaps knowing things that are true but are totally unbelievable would get close to my concept of Eldritch truth. In this case, an example of eldritch truth would be: fishes are solely responsible for all murders of people above age 50.

I also thought that perhaps it would be the realization of something like Edipo, the realization that what we did was unknowingly terrible, or fulfilled a prophecy which cursed us into doing something that broke our own sense of morality, and make us be unable to live with ourselves.

So, what do you think would be a tangible "Eldritch truth"? Which is to say, what do you think a character in a Lovecraftian setting would realize to go mad? I thought that all my examples are reductive, or not interesting enough, so I would like to hear your opinions!

Thank you for reading, and sorry if this is too off-topic!