Fabula
Object
Object

Vastial

The raw, unprocessed mineral chunk from the Cybermen's stores; functions as both explosive and temporal destabilizer when activated.
6 appearances

Appearances in the Narrative

When this object appears and how it's used

6 moments
S22E2 · Attack of the Cybermen Part 2
Doctor learns Cybermen comet plot details

Flast reveals Vastial—contained within a silver ammunition box—as a temperature-sensitive mineral whose explosive potential could annihilate Cybermen if heated to their body temperature. The Doctor immediately grasps its tactical value, transforming an inert storage object into the catalyst for a desperate countermeasure.

Before: Sealed inside a refrigerated silver ammunition box, inert and harmless at sub-zero temperatures in the storeroom
After: Revealed to the Doctor, identified as a potential weapon requiring controlled elevation to hostile temperature to activate
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S22E2 · Attack of the Cybermen Part 2
Doctor and Flast deploy vastial against Cyber guard

The vastial is activated when exposed to the Cyberman’s body heat, detonating in a focused thermal eruption that consumes the guard from arm to torso in seconds. Though frozen and inert in the storeroom, once laid as bait it becomes a transient yet overwhelming kinetic payload leveraged for decisive elimination.

Before: Sealed in a cold box at cryogenic temperatures, inert and stable.
After: Converted from a measured powder into a violent chemical explosion, then expended entirely in the blast.
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S22E2 · Attack of the Cybermen Part 2
Controller orders Doctor’s capture

Vastial is strategically combined with the sonic lance by Flast to create a temporal explosive, its volatile properties waiting to detonate upon Cybermen contact. The object becomes a calculated weapon against Cyber security protocols and personnel.

Before: Stored in chill-stable state as contraband weapon within Cryon reserves
After: Integrated with sonic device, warehoused in container, primed for deployment
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S22E2 · Attack of the Cybermen Part 2
Flast betrays crew to detonate Cyber Control

The Vastial, a volatile mineral fragment with unstable thermal properties, is placed inside a sealed box and its sonic core activated by Flast. The chilled explosive becomes a silent menace, releasing cold vapor that signals the proximity of an imminent, violent thermal detonation upon contact with heat—designed to obliterate Cybermen in the confined space of Cyber Control.

Before: Stored in a frozen state within the Cryon storeroom, its unstable nature kept dormant by cold.
After: Activated and primed; the sonic core hums, waiting for body heat or energy contact to trigger instantaneous, localized explosion.
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S22E2 · Attack of the Cybermen Part 2
Cyber Controller arms for final strike

The Vastial core in the storeroom grows steadily warmer, its unstable energy signature spiking as its potential weaponized output increases. The heat radiates through the storeroom, raising ambient temperature and contributing to the chaotic urgency surrounding its movement toward final assembly.

Before: Stored in cold ‘perfect state’ in a sealed container within the Cryon Storeroom, its volatile nature dormant under refrigeration
After: Actively destabilizing, glowing faintly and emitting palpable heat that warms the storeroom and signals the temporally irreversible countdown to activation
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S22E2 · Attack of the Cybermen Part 2
Cybermen secure temporal escape preparations

The Vastial’s unstable core is positioned by the far wall in the storeroom, emitting escalating thermal surges as the trapped energy destabilizes. Its volatile nature becomes a secondary threat, coinciding with the Cybermen’s final preparations, amplifying the room’s tension as history’s collapse nears.

Before: Contained in cold storage, minimally active and inert
After: Unstable and dangerously heated, radiating temporal energy
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