Adamantine

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Adamantium, also known by similar names such as Adamantine, adminium, adamantite, etc., is a fictitious metal or alloy common in media that's generally held to be stronger and lighter than titanium steel (titanium is far from being the strongest metal, and saying it is will trigger every engineer and chemist who hears you), if not outright completely indestructible. At other times it is stronger but heavier. Possibly high-carbon steel (in mythology, not fantasy). Vikings made high-carbon steel swords capable of cutting through shields, armor, and enemy swords and gave these magical blades to their greatest warriors. Remember, swords are piercing weapons, so imagine just how stupidly OP these things were if their mere cutting edge goes through steel plate.

In D&D

Adamantine is one of several magical metals that have appeared in Dungeons & Dragons and, alongside Mithril, is one of the most iconic. Characterized by its jet-black coloration, adamantine is known for being super-durable; weapons made of the stuff can cut or smash through just about anything, whilst armor & shields made from it are virtually unbreakable.

The metal takes its name from a legendary ultra-durable metal in Greco-Roman mythology.

In Dwarf Fortress

We might as well mention /tg/'s favorite Dorf game while we're here.

Adamantine is the best material in the game for weapons and armor, raw strands of it being mined from hollow veins near the bottom of the world. Be careful when mining them, though, or you're in for some fun. Mining adamantine without being buttfucked means your fortress can have nigh-invincible warriors, though make sure to use it to make sharp weapons. Adamantium's lightness and durability make for fantastic pointy things, but result in it being surprisingly shit when forged into hammers.

In W40K

Adamantium is the Khaine of materials in 40K, in that it is literally only ever mentioned or discussed in terms of how a given weapon can effortlessly cut or smash through it. The Worf of metals. In a way it seems to be one of those things where either a weapon is useless against it or adamantium is useless against the weapon. Nothing in-between.

In Exalted

In Exalted, adamant is the secret, SSR magical material. A clear blue crystal, stronger perhaps than any other substance, even the other magical materials, and rarer than any of the others as well. None of the canon Exalt types are resonant with adamant, save for the Alchemical's secret Adamant Caste. An Infernal can use adamant if it's tainted with vitriol, which is about the only place you'll see it in a non-Alchemical game.

As you might expect, adamant isn't given the attention that the other magical materials are given as a matter of course. Its mystic themes and uses in artifice aren't explored. They don't even say where in Creation it comes from!