Phyrium

Ah, the things you could accomplish with this. The pranks alone would be worthy of song.

— Sodai, Kaia

Somewhere between stone and metal, Phyrium is a rare material from the Far Deep that never cools. Phyrium holds any heat it absorbs and only extraordinary means will cool it again. It is difficult to find and even more challenging to harvest, at home in some of the most hostile caverns of the Far Deep. Only a handful of things have ever been forged from Phyrium, each with a legend to its name.

Description

Raw Phyrium takes the form of symmetrical black cubes, streaked with red, orange and lines of white at the edges. It has a texture similar to granite but alights with an angry glow from absorbed heat. When damaged, it chips and breaks like stone, spitting sparks of contained fire. Even at its coldest, Phyrium is warm to the touch.

by Rock Cafe.info

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When polished and sharpened, Phyrium gleams and cuts like metal. Its colors become more pronounced and pure, treated Phyrium has a color comparable to a naked flame.
It is heavier than steel and significantly harder to break. When heated, it begins to glow from red to white with wisps of heat curling off from the Phyrium.

When Phyrium touches with anything else, it releases a faint shimmering smoke that shifts between colors as it moves. The smoke is poisonous to inhale and cause small blisters on contact.

Properties

Above all else, Phyrium is famed for its ability to remain white-hot even in the coldest regions of Araea. Only direct contact has any hope of chilling Phyrium once it has been heated and even then, it is slow. Stories are still told of Phyrium weapon melting its way through swords raised to block it before the swing was even complete.
The same properties make the material almost impossible to work with mundane means. Phyrium doesn't melt and can't be cast, but must be ground into the appropriate shape and then polished. Before any work can even begin, it must be cooled down to at least a tolerable temperature.

The greatest work with Phyrium has not been done with hammer and anvil, but with Thaumaturgy. Thaumaturgs bend the stone-metal with will and force it into shape with ritual to create objects well beyond any mortal smiths, molding the ever-burning Phyrium like clay.

No one is sure if there is a limit on how hot Phyrium can get. If there is, no one has yet to see it - not even in the heart of Hkata, where Phyrium sprouts from the ground and glow white-hot from the heat.

Hkata
A hellscape of choking smoke, abyssal plains of ash and rivers of molten fire, Hkata is where nearly all Phyrium have ever been found. It is a Far Deep region of fire and ash, where only the most skilled Kaia can hope to survive.
Read More About Hkata

by Rock Cafe.info

Unquenchable Flame

Phyrium can be cooled, but only with great effort. Even completely submerging Phyrium is not guaranteed to work, as the Phyrium might melt or evaporate whatever it was encased in before it can be cooled.
Every smith who works Phyrium must find their own way. Every piece brought out from the Far Deep is unique and there have never been enough to establish any sort of sure way.

by Rock Cafe.info

A few treasure Phyrium for different reasons, using the ever-burning stone to heat their forge or create blazes that melt anything.
Such forges imbue the metal it works with a spark of the Phyrium's essence - or so the legends go.

by Dive Store Exile

Under Construction - But let me know what you think and what you'd like to see added!