Ancient Wyveria's need for monster parts

Haven't seen this dialog from Suja posted before.

"Downed by thunder" should refer to the Wind's Gasp function when it was still intact.

Before reading this, I assumed a more passive/defensive function but it sounds like they wanted the monsters to be killed for parts.

(circles also back to the idea that this desert used to be a bit more lively)

The seikrets were then used to transport the monster parts, most likely to Oilwell as the Bonefolk have stories of them having access to massive amounts/ large monster parts (something that puzzled Erik but could be explained by this).

The timeline is a bit weird because if they are talking about Wyveria City's tech in the Plains, you would think that they have more advanced ways of transporting goods...

But why did they need so many monster parts?

We know that Suja residents think our weapons look similar to relics weapons, so could it be that the people of Wyveria (or even before that) crafted weapons from monster parts just like us?