>>96379730
It's definitely something that suited Thaumiel to Dis, where she'll be using it inside of the same horrifying basement where the unrepentant bitch only teaches it to vulnerable youths of her preferred sex.
We can guess that the ideal conditions are very much like that, dark, dirty, and all horrible, unless Thaumiel is just negligent or sadistic toward her own subjects. You definitely need a supply of nightmare, real physical loads of the stuff are best, remember that blue grease is just nightmare dragon oil, but it's good on you if you're able to tap into the omnipresent dreamfield of the spiritual plane or what not.

It probably works like spawners in Minecraft, as a technomagical invention that feeds on horrible ambiguity plus evil juice.