To be in an ivory tower is to be remote from the world, out of touch with reality, and probably devitalized. (Devitalized? okayyyy….) This term is often a connotation to writers or artists. A fall from your ivory tower? I feel doomed. Click here for help.
A bit lighter here: An invocation is an appeal or request for help to a higher authority or to God.
NOM DE PLUME –
A nom de plume is French for “Pen-Name”. This is a fictitious name used by a writer. NOM DE GUERRE is the French term for an author’s pen name. Another useful word: pseudonym.