How to Solve Roman Numeral Room
Since getting here is kind of weird i'll show you the path in order to access this room. You'll need to go to Desecrated Cistern and go down this left path which you may have already been down and been bouncing up and down trying to get to the platform that you feel the noob idiot the penitent one could grab onto... Anyways, you'll need the Nail uprooted from Dirt which you get in Redento's Questline
Once you go through the corridor you'll notice a lever and two locked gates which you might of already seen. Well you are now on the side with the lever so you can pull that sucka and push on through where you'll find another Cherubim and on the right side a bone fragment
On the left side you'll find the Roman Numeral room now if you are like me and have watched Rick and Morty and have an IQ of 200 you'll know the Roman Numerals are numbers and you'll know what they represent I = 1 II = 2 III = 3 IV = 4 V = 5 etc... So, you'll now need to speak with the ghosts and you'll get a hint as to what to do here...
You will need to speak to the ghosts for you to be able to do the puzzle so equip the Shroud.
Right Ghost: Half do not return
Left Ghost: Everyone passes...
I made the solution a video as it was just easier to demonstrate but, if you wanna try and figure this one out on your own then don't watch the video
Alternatively, you can hover over this text for the solution
Just run in and out of the room on the left side a few times and on the right side a few times.
Left Side: IV (4)
Right Side: II (2)
Once you have solved the puzzle you'll find the Silver Grape which is an awesome bead that raises all your defence stats significantly!