Treasure trove
Entire shelves were stocked with bottles and vials containing pills and potions the likes of which they had never seen. There were minor medical tools, bandages and antiseptics. There were also well preserved, well packaged raw materials that were commonly used in the manufacture of Eldrim cards.
Nero didn't even bat an eye when he saw a transparent block that contained a still living lead. He had basically come to accept the fact that the Eldrim basically just wielded immortality as they wished and how they wished. Preserving a few ingredients was a lot more feasible than monsters.