Adamantium

Adamantium, also known as hellsteel or, informally, neutronium, is a deep reddish supermetal produced from the refinement of extremely rare adamantite ore. Compositional analysis places it as primarily tungsten and osmium by mass, but the remainder, constituting roughly 15–20% of the material, is composed of elements which do not correspond to any known position on the periodic table. Foreign laboratories have been unable to replicate its properties using any combination of known materials.

The material presents an extraordinary density of approximately 24 g/cm³, placing it among the densest stable substances ever recorded. Despite this, it demonstrates extreme resistance to both tensile stress and compressive deformation, and will not fracture under any pressure yet achieved in laboratory conditions. Most remarkably, adamantium is pyrophoric: it ignites spontaneously on contact with atmospheric oxygen above a threshold temperature, releasing intense heat. This property makes it simultaneously dangerous to work with and lethally useful in armour-piercing munitions.

In ballistic terms, an adamantium projectile fired from a standard 7.62x51mm chamber using Firedust propellant delivers approximately half the kinetic energy of a .50 BMG round, nearly triple what a conventional round of its calibre produces. The combination of extreme density, penetrator hardness, and pyrophoric ignition on impact makes adamantium the premier armour-defeating material available to Oceanykan forces and, through grey-market channels, to parties willing to pay its considerable price. Munitions made from adamantium include Armour Piercing Hellshot cartridges for small arms and APFSDS Hellshot for cannon.

Working adamantium requires specialised tooling, inert-atmosphere forges, and considerable expertise. A very small number of Oceanykan smiths possess the relevant skills, and most adamantium work is contracted through a handful of licensed firms.