Good for you, OP. The mangas been on my backlog since forever, but I caught the first season of the anime. It was really fun some years back when it was first airing and 4/tg/ was abuzz with newly inspired discussion on megadungeons, magical evolution theory, fleshing out archaotech, and semi-isolated ecologies. It was good times.
Hopefully, once Tsukushi finishes the story his publisher will release a coffee table book/world guide/lore bible in the same vein as Dungeon Meshi's. It's unlikely, but still possible.