[quote=@Turboshitter]
<Snipped quote by Over Illusion>

I swear I can’t fucking keep up with all this new shit that keeps coming out of Grand Order and the Fate franchise’s bajillion spinoffs >_<

P.T. and Elemental were things I just added because they made sense with Baba’s lore. I can replace them with something else if they don’t work for whatever arbitrary reasons the wiki decided weren’t important enough to mention on the skills page. As for the hut, it’s mobile because that’s what it does in the legend :P

Seriously though, do you want me to justify it based on in-universe rules or do you just want a throwaway explanation as to why it can do that? Also I’ll agree with whatever rank you think the mortar and pestle should be. I just thought that since it was chariot-esque and capable of flight it should have a moderately high rank.
[/quote]

Potnia should be removed since Authority's a no-go and Potnia itself is super strong even among Authorities, so it's not the best move either mechanically or for balancing. 

For Elemental, here's Paracelsus's skill from GO Mats. 

[quote]Elemental: A+ 
The ability to make use of artificial spirits corresponding to the five elements. These spirits are called Elementals, or more informally Elemental Masses by Paracelsus. Exactly what it sounds like, they are existences created using a super-high density crystal as a base. 
For example, a Fire Elemental Mass is made from concentrated flame, and can manipulate incredibly high temperatures. An Earth Elemental Mass becomes super-high mass, gaining a hardness similar to that of diamond. (As a note, the Ether Elemental Masses made from the element of Nothingness are different from Ether Clumps, so please be careful.) 
Though it takes considerable labour to produce them, they can be used as effective familiars even in battles against Servants.[/quote]

Ergo, he makes a philosopher's stone, then does even more stuff to it until it becomes a cool familiar guy. I'll need some sort of lore justification for how she's able to do this without a philosopher's stone.

Really the Mortar and Pestle doesn't do anything particularly special even by modern magecraft standards, so it should prollly be E.