Ohh, whatever happened?
The Petralith is an important weapon in the fight against the Balaur.
Up till now we thought that only the Jotuns could manufacture the Petralith, but our research now shows that that is not the case.
According to research, it wasn't just Jotuns who had to do with manufacturing Petralith, so did the Nevilim.
But so far it's just an assumption that has not been substantiated yet.