The lore drops about the Dragon Veins and Utsuro's immortality are crucial for understanding the final battle ,and the sense of dread is palpable. The image of the Altana erupting from the Earth, painting the sky in a haunting, sickly green glow that's the beginning of the end . Everyone is giving everything. The fact that Utsuro is actually losing his regeneration is a massive deal. It means they have a chance, but the cost is real.