Huh, I guess could be. I’ll definitely check that book out.
Oh and I too googled ‘Lethalium’. But what came up was a made up RPG story someone had created in forum. Within it described a world one could classify as similar to the Greek creation myths or Norse pagan myths. It described two gods struggling for power and from the blood they shed became a precious substance sort of like the philosopher’s stone in the sense that it granted eternal life. I can’t really remember the rest of it but I never found the site again.
Perhaps, it’s something to do with medicine or science? Maybe?