Okay so I don't really know what the differences between a normal and a Lunar primal are, but I think the towers are essentially mini Dalamuds. The beastmen are being tortured to summon the Lunar primals, and Fandaniel will somehow harness the aether/energy of the Lunar primals to destroy the star. That might not be the whole story, but I think that's what's happening.
---
Nintendo Network ID: papercups 3DS FC: 4124 5916 9925