Like Anput had asked of me, I sorted through the various bones from that completely non noteworthy Tza Fiend we had killed and organized the pile of high quality materials in order of their mana capacity as well as the mana quality.
It was interesting because certain bones had a higher or lower score that made a lot of sense if you really thought about it, like how the femur had a large capacity but the finger bones had a higher quality, and obviously the skull had been the biggest boon from that fight with a surplus of both waiting for us to make use of it.
The bones location inside of the body seemed to matter more than the actual quality of the bone itself, since some of the thicker bones weren't that impressive compared to the smaller and thinner bones that were closer to areas of higher magical concentration, be it for the spells engraved onto the Fiend's flesh or if it was a location that was just more accustomed to mana flow.
