Speaking of respawns do the slimes ever stop on 9? I went in there once and then reloaded and never went in there again. With infinite spawns that level will sooner or later crash because there is no room for a slime to occupy it. Sooner or later they stack on top of each other so much as well that the player will get face smashed by 10 or so slime attacks at a time and then when those singles split there is a huge potential for crash and well impossible fighting.
As for that writing on the wall I did find it and wrote it out and have been staring at it.
your 4x7 room theory works but looking over the maps I find no 4x7 rooms.
Also the first line only has one letter. There is a total of 6 stars which can correlate to the word for the level. In addition I recall starting that level and getting one stone so it could be a hungry pit situation. As far as I remember none of the notes can match up to that wall.
Also if that is a secret than that makes 5 for that level which goes against the 4 count in the post.
As of now my theory is the 4x7 room or a statement of some kind which the stars are breaks in the sentence.
I have not found any pit rooms that look like that either.
Also could be morse code.
There are so many variables it is all guessing.
I did manage to get to the final battle on hard mode even with all that insane stuff and then I had to take a break when I saw what I had to fight there.
There really is simply too much damage output without enough mitigation options given the game mechanics. It is all rng and hope for a lot of evades and the goromorgs to cast spells I am resistant too. I will admit to cheat slaying the skeletons through the bars on 7 where the entire hallway filled up with them and on hard the only hits that get through are crits and specials which use a ton of energy so fighting 6 very damage resistant skeletons was not on my list of things to do.
Update:
I ended up cheating the final battle on hard. I was not proficient in air magick and only one scroll of lightning resistance with 4 archers shooting me in the face they were 2 shotting my main tank.
There are some really amazing elements in this mod and then there are these absurd battles that are more about getting lucky than winning at a strategy. 4 spots free of lightning bolts with full line of sight to archers is meh... Not to mention if you shoot arrows you have to go pick them up to proceed to final switch.
Wonder if we will get some idea on that wall text...
I ended with 42/44 secrets. Missed the one after the Sea and one other one which seems to be on 5 I guess.