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Wikipedia There is more information available on this subject at Nuclear weapon on the English Wikipedia.


The atom bomb mushroom cloud seen in the bombing of Nagasaki in World War II.

A nuclear weapon is a type of ordnance where nuclear reactions are harnessesd for their destructive effect. Using nuclear fission and/or fusion as a source of energy. The yield of a nuclear weapon is measured in the number of tons of "TNT" needed to generate an explosion of similar proportions.

An operational idiosyncrasy of nuclear weapons was the result of containing fissile material. Fissile material emitted a readily detectable Čerenkov Radiation signature upon exiting slipspace that negated stealth measures, NOT to be confused with the atomic bomb.[1]

For Reference[]

The nuclear yields of three real-world atomic weapons are shown:

"Fat Man" Atom Bomb (Last nuclear device used in war, 1945): ~21 Kilotons TNT

Mk. 17 Hydrogen Bomb (Largest-yield US nuclear device, mid-1950s): 25 Megatons TNT

Tsar Bomba/Emperor Bomb (Most powerful nuclear weapon ever tested, 1961): 50 Megatons TNT

UNSC Nuclear Ordnance[]

The UNSC employs a range of nuclear ordnance.

FENRIS Nuclear Warhead[]

Main article: FENRIS Nuclear Warhead

The FENRIS is a type of low-yield thermonuclear device. They were slated for decommissioning but munition expenditures during the Human-Covenant war saw the survivors return to service.[2][3][4][5]

Medium Fusion Destructive Device[]

Main article: Medium Fusion Destructive Device

The MFDD is a tactical nuclear device with a yield of approximately 15 kilotons. Due to their apparent similarities, the MFDD may actually be related to the Fury nuke.[6]

Fury Tactical Nuclear Weapon[]

Main article: Fury Tactical Nuclear Weapon

The Fury is a small device with a yield slightly less than a megaton. It is extremely clean. It is the "closest thing the UNSC has to a nuclear grenade."[7]

HAVOK Nuclear Warhead[]

Main article: HAVOK Nuclear Warhead

The HAVOK is a 30 megaton thermonuclear device. Its warhead may be removed and carried by a F-41 Exoatmospheric Multirole Strike Fighter. Some were delivered by ground forces during the Human-Covenant War.[8][9][10] It saw continued service in the Post-war era.[11]


Main article: HORNET Mine

The HORNET is a 30 megaton space mine. The devices are stealthy and carried aboard UNSC prowlers.[12]

NOVA Bomb[]

Main article: NOVA Bomb

The NOVA is a strategic device, and undoubtedly humanity's most powerful weapon. It consists of 9 nuclear warheads encased in a lithium triteride shell, which is compressed during detonation, boosting the yield "a hundred-fold."[13] A single NOVA has enough power to cause complete devastation on a planetary scale, and can destroy orbiting moons and Naval fleets.[14]

Shiva-class Nuclear Missile[]

Main article: Shiva-class Nuclear Missile

The Shiva is a type of starship ordnance.[15][16] Its warhead may be removed and carried by a C709 Longsword-class Interceptor.[17]

Jiralhanae Nuclear Ordnance[]

While no specific iterations are mentioned by name, the Jiralhanae are known to have nearly obliterated all life on Doisac with nuclear weaponry during a pre-Covenant conflict.


  1. Halo: Ghosts of Onyx, Chapter 22, page ??
  2. Halo: Ghosts of Onyx, Chapter 1, page ??
  3. Halo: Ghosts of Onyx, Chapter 23, page ??
  4. Halo: Ghosts of Onyx, Chapter 24, page ??
  5. Halo: Ghosts of Onyx, Chapter 39, page ??
  6. Halo: Reach: Deliver Hope trailer
  7. Halo: First Strike, Chapter 1, page ??
  8. Halo: The Fall of Reach, page 200
  9. Halo: The Fall of Reach, page 212
  10. Halo Wars: Genesis, page 17
  11. Halo 4, Composer
  12. Halo: Ghosts of Onyx, page 325
  13. Halo: First Strike, page 180
  14. Halo: Ghosts of Onyx, page 244
  15. Halo: The Fall of Reach, pages 147, 322-324
  16. Halo: The Cole Protocol, page ??
  17. Halo Encyclopedia, page ??