This poem inverts the usual Dickinson formula. Instead of depicting pain, she wants to inflict it—specifically, pain that "Surgeons assuage in vain." The word instill means to introduce drop by drop, suggesting deliberate, measured cruelty rather than sudden violence.
The necromancy reference is key. By the 1860s, necromancy had two meanings: raising the dead (popular usage) and divination through consulting spirits (original meaning). Dickinson's "wizard erudite" suggests learned magic, not graveyard conjuring. She's asking for specialized knowledge—how to create unhealable wounds.
Context: Dickinson wrote obsessively about psychic pain that has no physical remedy. Poems like "I felt a Funeral, in my Brain" and "After great pain, a formal feeling comes" catalog suffering beyond medical reach. This poem flips the script: instead of being the victim, she wants to be the inflictor. It's her revenge fantasy in miniature.