Definition of necromantically in US English:
necromantically
adverb
In a necromantic manner; by, or as if by, necromancy; with regard to necromancy.
Origin
Mid 17th century; earliest use found in John Gregory (1607–1646), orientalist. From necromantic + -ally; compare -ically.
Pronunciation
necromantically
/ˌnɛkrə(ʊ)ˈmantɪkli/