Source : Webster's Revised Unabridged Dictionary (1913)

Necromantic \Nec`ro*man"tic\, n.
   Conjuration. [R.]

         With all the necromantics of their art.  --Young.

Necromantic \Nec`ro*man"tic\, Necromantical \Nec`ro*man"tic*al\,
   a.
   Of or pertaining to necromancy; performed by necromancy. --
   {Nec`ro*man"tic*al*ly}, adv.

Source : WordNet®

necromantic
     adj 1: relating to or associated with necromancy; "mysterious
            necromantic rites" [syn: {necromantical}]
     2: given to or produced by or used in the art of conjuring up
        the dead; "a necromantic sorcerer"; "necromantic
        delusions"; "necromantic powders and other weird objects"