What to do in this room ? (desecrated cistern)

[fab]

It seems to me that both walls were empty the first time I passed here, now there’s an "I" ?!
https://www.noelshack.com/2019-37-4-1568299048-screenshot-3.png

[willy bammy]

I figured it out. The two corpses hint "everyone passes, half do not return."
Numbers get added to the white circles everytime you enter the room from the respective circle's side. The trick is to make the right side circle (half do not return) have half the number of the left side.
I solved it once the left circle had 4 and the right one had 2.

[fab]

wooo thank you for the silver grape, 99,5% now for me !

[ScareKrow]

Edit: nevermind thank you lol

[fab]

equip the relic to speak with corpse before entrering the room

[Cat On Ice]

Also need the relic equipped to see/activate the counters