Under intense pressure, hydrogen transitions into a metallic state; which in normal conditions, when eased, reverts back to a liquid or gaseous state. However, foam-phase munitions were designed to allow a mass of metallic hydrogen to remain stable, until impact, where it would explode catastrophically. Foam-phase weapons could be used conventionally, or as triggers to larger fusion/fission bombs.
Foam-phase weaponry became a staple of the Demarchist military after the Melding Plague, when they lost the ability to produce antimatter in militaristic useful quantities. Gas giants, such as Tangerine Dream, naturally contained metallic hydrogen at extreme depths.
| Melee weapons | Whiphound | Crossbow | Clockwork gun |
Slug-gun | Submachine gun | Dart rifle | Electromagnetic needle-gun
"Beamer" pistol | Particle-beam rifle | Plasma rifle | Plasma bazooka
|Ouroborus-class Worm | Weevil-class War Robot | Whiphound|
|SPACECRAFT WEAPONRY AND DEFENCES|
| Magnetic railgun | Boser | Ack-am | Foam-phase Munition | Pin-head munitions |
Camouflaging screens | Hypometric weapon | Bladder-mine
|Cache Weapons | Solar Weapon|