Marvel Studios is hinting at the X-Men's future through subtle references in Captain America: Brave New World, particularly the introduction of adamantium—a significant element of X-Men lore. Although the film does not explore the metal's properties deeply, its discovery connected to the Celestial corpse from Eternals sets the stage for potential character developments. Japan's pivotal role in the quest for adamantium also ties into X-Men's broader continuity, suggesting a blending of stories that could resonate with future films, despite no immediate X-Men movie being on the horizon.
Brave New World not only introduces a major pillar of the X-Men setting - adamantium, a metal that can cut through (almost) anything - it introduces it in a way that creates a foundation for a whole subcategory of X-Men characters.
Much of Brave New World's plot revolves around the discovery that the Celestial corpse from Eternals, frozen mid-emergence in the middle of the Indian Ocean, is full of adamantium.
The metal itself is just a name-drop in Brave New World: Its properties are never really unpacked or demonstrated. It's just described as a metal that rivals vibranium for indestructibility.
Brave New World gets deeper into X-Men lore, however, in centering Japan as the face of the other nations competing with the American government to claim all that adamantium.
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