Raff wrote this article a few years ago, talking about ways to get the most out of the Archmage plenipotentiary. The advice is also relevant to anyone who needs to communicate with an NPC at one remove - via Winged Messenger for example.
It’s just been uploaded to the wiki to make it easier to find; why not give it a look? It’s a “design article” which means it has a more informal, chattier tone than many of our wiki pages, and at least one of the references is apparently three decades out of date. But if you haven’t read it you might find something useful in there!
You’ll find the article here: https://www.profounddecisions.co.uk/empire-wiki/Talking_to_eternals
(Illustration by Christopher Hoyle)