Eiro sat in his library and was reading up on the Arcane Runes that James recognized the runes on the metal ball to be. The Demon hoped that he would be able to find some sort of clue toward what exactly the metal ball did. Luckily there was a book about these runes here in the library. The hidden one adjacent to this just had lots of books about spells and hidden history, as well as numerous notes on different monsters and organizations. The Demon would read through those in due time, but this kind of thing was more important at the moment.
"Hm..." He hummed lightly, comparing the runes that were sketched in this book with the ones he remembered from the rock slab, the light-activation plate from the Goblin Village, as well as this metal ball. He mentally connected all of this, and with his 'Quick Thought Processing' ability from reaching 300 Intelligence also helped with that quite a lot.