Atium

Atium is a fictional metal that features prominently in Brandon Sanderson's fantasy novel series, Mistborn. It is one of the rarest and most valuable substances in the world of Scadrial, the planet where the series is set. Atium is a metallic alloy, with its exact composition being a closely guarded secret. Its primary function is as a magical enhancement, burned by individuals known as Allomancers to amplify their innate abilities.

Allomancers who ingest and burn atium experience a significant boost to their powers. For example, a Mistborn, who can use multiple Allomantic abilities, will find their powers exponentially stronger and more precise when under the influence of atium. The most notable effect of atium is the creation of temporary, multiple sensory "ghosts" of reality, allowing the burner to perceive all possible actions and reactions simultaneously. This grants them an immense tactical advantage in combat, as they can predict and react to an opponent's moves with incredible speed and accuracy.

Due to its immense power and rarity, atium is a highly sought-after commodity, often used as currency or as a means to gain significant political or military power. Its production is tightly controlled, and its use is often restricted to the ruling elite. The scarcity and power of atium are central to many of the conflicts and plot developments within the Mistborn series. Over time, the nature and origin of atium are explored, revealing a deeper connection to the divine and the world's creation.