The Cloud (Sierra Madre)

Mutations & FEV · Source: Fallout: New Vegas Dead Money and Old World Blues in-game lore

Overview

The Cloud is a deadly, corrosive red gas that fills the Sierra Madre resort, making the treasure of the casino a lethal prize. It is a weaponized biological agent developed pre-war. The Cloud reacts violently to movement and organic matter, turning the resort into a death trap.

Origin & Mechanism

The Cloud was developed as part of Big MT's biological weapons research, refined into a self-sustaining weapon. It was deployed or released in the Sierra Madre, where it became trapped by the resort's sealed walls and weather systems. The Cloud is attracted to motion and heat, swirling toward anything that disturbs it.

Effects & Symptoms

Exposure to the Cloud causes severe respiratory damage and death within seconds without protection. It corrodes organic tissue and even damages equipment over time. Gas masks and sealed armor provide only temporary protection.

Wasteland Significance

The Cloud makes the Sierra Madre's legendary treasure nearly unreachable, shaping the Dead Money story of obsession and loss. Its existence demonstrates the reach of pre-war weapons research into everyday life. The Cloud's containment failures foreshadow the dangers of pre-war science.

Notable Appearances

The Cloud appears in Fallout: New Vegas's Dead Money DLC and is explained in Old World Blues. Its lore is also tied to the tragic stories of Dean Domino and the resort's creator.

Tags: the-cloud, sierra-madre, dead-money, big-mt, bioweapon, gas, corrosive, poison, casino, red-mist