Necromancer -> Necroman -> Groman -> Gromar
How the hell did she manage to write a book?
Nekuromansaa (ネクロマンサー) -> Nekuroman (ネクロマン)- > Guroman (グロマン). Incidentally, the Gromar part in the raw is still at "Groman/Guroman".
Basically it just involves the ku/gu swap and shorthanding stuff, plus guro reference. Also, subtly not? racist since "kuroman" could be taken as "black man", in other words that end sign would basically come off as "No Blacks Allowed" if the swap didn't happen.
Knowing how to play around with words would actually be pretty helpful in writing. Even if said writing it just taking someone else's writing and reworking it for another audience.