C499 The Truth from a Thousand Years ago

What is this?

Leonardo was somewhat stunned.

Where did Rose Religion get this Strasla Coil from? Did they invent it themselves?

No, that was not the most important question.

The Strasla Coil itself did not have the ability to generate electricity... Then what did the Rose Religion use to generate electricity?

Using love?

Or...

Leonardo had some guesses in his mind