Weltall is a powerful Gear (mecha) in the video game Xenogears, piloted by the protagonist, Fei Fong Wong. As one of the central machines in the story, Weltall plays a crucial role in battles and is closely tied to the unfolding mysteries of Fei's identity and past. Its mysterious origins and evolving forms make it a symbol of both strength and hidden danger throughout the series, reflecting Fei's own struggles and transformations as the narrative progresses.