Playing around with Necromancy on test, apologies if this has all been documented before.
Granite + Cinnabar = Strength
Slate + Halite = Dex
Marble + Dolomite = Int
Travertine + Sulpher = Spirit
Limestone + Nitre = Con
Emerald Tablet for extra Philosopher's Solution
Multi-Magnification Goggles for additional body part slots
Vestige token into the spirit bank
Select at character creation
Some experimentation I did at an early phase, here's the difference in starting stats form that one:
The large stone ones. That would make sense, and I was wondering if it was some sort of NPC that wasn't visible to me. I'll try to get close and get some screenshots of it happening then report it. Obliged.