Plague Inc.: How to Unlock All 3 Xenolith Secret Endings

To unlock the three secret endings for the Xenolith disease type in Plague Inc.—Total Crystalline Assimilation, Subjugation, and Annihilation—you must infect the entire global population while keeping lethality at zero, then evolve a specific high-tier trait branch. If the host population dies from standard organ failure before your target branch triggers, the match ends with a generic extinction victory rather than a secret ending.

Note: The Xenolith disease type debuted on PC in Plague Inc: Evolved; mobile releases depend on current platform updates.

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Universal Setup: Global Spread and DNA Management

Every secret ending requires complete global transmission before committing your DNA to terminal branches.

1. Start in an interconnected hub: Choose a country with busy sea and air routes to establish early international spread.
2. Prioritize non-lethal transmission: Invest early DNA into basic air and water vectors alongside cold and heat resistance to reach isolated regions such as Greenland and Central Africa.
3. Refund lethal mutations immediately: Devolution keeps your severity low, preventing world governments from deploying early research labs and prioritizing cure development.
4. Bank your DNA reserves: Keep 65 to 80 DNA points unspent while waiting for the global uninfected count to reach zero. Avoid buying redundant transmission upgrades once all borders and ports are compromised.
5. Slow the cure via unrest: If cure progress approaches 50%, evolve early cognitive disruptor traits to slow international research coordination rather than wasting large DNA pools on high-tier genetic reshuffles.

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Ending 1: Total Crystalline Assimilation

The Assimilation ending converts all biological tissue into an extraterrestrial crystalline entity. It requires zero lethality and full global saturation.

• Prerequisite: 100% of the world infected, zero dead hosts.
• Mutation Order:

1. Neural Encasement: Stabilizes host nervous systems and shields the organism from immune responses without raising severity.
2. Resonance Harmonization: Links hosts via bio-frequencies, heavily increasing infectivity.
3. Planetary Lattice: Serves as the catalyst trait, uniting all organic material into a synchronized planetary monolith.

• Result: After evolving Planetary Lattice with no uninfected humans remaining, wait for the corresponding narrative pop-ups to trigger the unique Assimilation victory.

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Ending 2: Subjugation and Mind-Meld Control

The Subjugation ending forces world governments to surrender authority to the Xenolith entity through psychological domination.

• Prerequisite: 100% infection across all major world powers, zero lethality. If populations die in large numbers, national governance collapses and prevents official surrender.
• Target Traits:

• Result: Civil institutions systematically collapse into psychological subservience, prompting an unconditional planetary surrender.

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Ending 3: Biomechanical Shatter (Annihilation)

The Annihilation ending wipes out humanity in a rapid, coordinated detonation by rupturing crystalline formations inside every host simultaneously.

• Prerequisite: Exactly 0 uninfected humans remaining worldwide, 65–80 banked DNA points, and zero lethality prior to the final sequence.
• Execution Sequence:

The moment the final healthy human is infected, rapidly evolve these three physical crystallization traits in succession:

1. Vascular Mineralization: Calcifies circulatory systems and spikes severity.
2. Internal Spire Formation: Drives crystalline growths through internal organs to trigger immediate, severe lethality.
3. Resonant Shatter (Apex Trait): Emits an acoustic frequency burst through the network, fracturing all mineralized hosts at once.

• Result: The sudden lethality spike eradicates the global population in days, bypassing late-stage cure acceleration and triggering the Annihilation ending.