End of the Worlds Iceberg

Tier 1
Deep Impact Event
Supervolcano Eruption
Mass Pandemic
Microplastic Poisoning
Death of the Sun
Global Hunger
Global Anarchy
Global Warming
Nuclear Warfare
Global Financial Crisis
Pollution of the Atmosphere
Tier 2
Wandering Black Hole
Superflare on the Sun
Megafauna
Breakup of Tectonic Plates
Grey Goo
Zombie Apocalypse
Collision with a rogue planet
Alien Invasion
Gamma-ray Burst
AI Revolution
Collapse of the Internet
Kessler's Syndrome
Incidental change of the asteroid's trajectory
Second Coming
Antibiotic Apocalypse
Dinosaur Takeover
Tier 3
The Rapture
Wandering Pulsar
Simulation Shutdown
Gravity Inversion
The Strangelet Experiment (Gone Out of Control)
Condensation of large amounts of dark matter
The Big Freeze
The Big Rip
The Big Crunch
The Great Filter
Artificial Black Hole
Time Paradox
Eternal Winter
Heat Death of the Universe
False Vacuum Decay
Polar Inversion
Singularity
Tier 4
Antichrist's Arrival
Hollow Earth Collapse
Mass Demonic Posession
Year 2038 Problem
Earth's Core Decay
Parasitic Assimilation
Collision with the Moon
Eternal Night
Water Dissapearance
Hell Invasion
Hostile Takeover
The Happening
Alternate Humanity
Ultrafauna
Ecophagy
Tier 5
Rise of the Fantastic Creatures
Hive-Mind Assimilation
Cognitive Massacre
Merging with the Mirror Dimension
Audio and video desynchronization (in real life)
Invasion of Lovecraftian Entities
Roko's Basilisk
Earth Stops Spinning
Time Collapse
Boltzmann's Brain
Superintelligent Disease
Dimensional Split
Thaumaturgical Revolution
Rogue Reality Manipulator
Mass Psychogenic Illness
Digital pandemic
Tier 6
Dark Forest
Truman Show Revival
Quantum Non-Existance
Necrosociety
Memetic Pandemic
"The Flash That Hates"
Forbidden Knowledge
Absolute Sterilization
Krampus Krisis
Massive entry into a time loop
Dream Invasion
Metaphysical Collapse
Consequitive CP symmetry violations
Tier 7
Death of Information
Entanglement of the Timelines
Mandela Effect Cascade
People stops sleep
Antimemetic Pandemic
SCP-5000("Why?")
The Shy Guy Photo Broadcast
Noosphere Pollution
Liminal Gateways
ΩK-class Scenario
Retrocausal erasure
Prion Mutation
Chromosome Decay
"When Day Breaks"
ZK-Class Scenario
Essophysical Failure
Universal Paperclips
Pataphysical Collapse
Mass Knowledge Event
God hits CTRL+Z
Tier 8
Galactic Empire Invasion
A Quiet Place Scenario
Global adoption of the red pill from the Matrix
Bird Box Scenario
Upside Down Invasion
Smile Dog Global Broadcast
Cthulhu Awakens
T-Virus Outbreak
Kaiju Invasion
The Fourth Reich
1984 IRL
Weirdmageddon
Daybreackers Scenario
The Thing
Snowpiercer Scenario
Tier 9
Reverse Rapture
Informational Hazard Cascade
The Final Dogma
God's Suicide
Speed stops to absolute zero
Backrooms Overflow
Tulpa Invasion
Unhinged Realms
Philosophical zombie apocalypse
Collision with a neighboring universe
Retroactive Realization
Enter in the developer's room
Mass Rickrolling
Solipsistic realization
Mathematical Failure Scenario