demonomy

Apparently formed within English, from demono- +‎ -nomy.^[1]

demonomy (uncountable)

1. (obsolete) The dominion of demons; devilry
   • 1638, Tho[mas] Herbert, “Of Iava major”, in Some Yeares Travels Into Divers Parts of Asia and Afrique. […], 2nd edition, London: […] R[ichard] Bi[sho]p for Iacob Blome and Richard Bishop, →OCLC, book III, page 325:

     But theſe Iavans are drunck in their demonomy; they the more earneſtly imbrace it, by how much their poyſoned natures abhorre honeſty.

• demonomist

• “demonomy”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.