The Lifehold Core is the story-exclusive final region in Xenoblade Chronicles X. It is the location of the final battles in the plot, and can only be entered during Chapter 12. After this, the Lifehold Core is still present in the waters of Cauldros, but it can no longer be entered. Although the Core's interior is a sheltered location, after entering the HUD shows the weather to be thunderstorms, regardless of what the weather was outside. The weather changes to clear for the second phase of the final boss battle.