This post links to others about Diomedes.
polar species hibernate;
at 45 degrees latitude, Diomedeans are palaeolithic;
at 30 degrees, the Lannachska are quite cultivated;
the Drak'honai, from even further south, have neolithic technology -
molded synthetic resins
a sort of astrolabe
navigational tables based on sun, stars and moons
almost no iron so no compasses or chronometers
no copper or silver, so no electrolytic technology, therefore no use for their abundant magnesium, beryllium or aluminum
The Tyrlanians exchange furs, gems and juices for metal tools and weapons. The Drak'honai should want and be able to afford clocks, slide rules and Diesel engines.