I got the ritual for the bottom half to work fine, but the top half is not activating. I followed the instructions in the Necronimicon and set it up correctly, have the required P.E., and have a villager on site as a sacrifice but the ritual won't activate.

Nvm, it has to be a mod compatibility issue, tested it alone and it works fine, will post when I find out the issue

There are a bunch of places in the 1.12 version where checking for entities within certain bounds fail due to said bounds being incorrectly offset.