Ichor

Also referred to as engrammatic matter or mnemonite, ichor is a kind of amorphous material formed by infusing engrammatic soulfire. It naturally encrusts surfaces over time if they are exposed to any amount of infusion, as permeability gradients slightly bunch up incoming soulfire, which is then slowly infused by the local conscious pressure.

Deliberately produced ichor is often used as currency. However, infusing spun soulfire takes significantly more intention then its unspun counterpart, which further scales rapidly with volume and spin count. This means that actually producing ichor is a notable mark of phlogistic strength.

Aside from it's rather negligible ability to serve as engrammatic mass, ichor also has the notable property of having completely manipulable mechanical properties, which is why the corpora of many non-biological persons are formed of it, and where its name is derived from. Before the nature of ichor was understood, it was believed to be the blood of demigods, since cuts against such powerful phantasms would loose the ichor which composed their body, causing it to liquefy and evaporate.

If no action is taken to generate an imaginary surface, its color and appearance is dependent upon the producer and their intentions. Generally speaking, phlogistically denser ichor is more colorful, and has many river-like veins flowing along it. Regardless of rigidity, it has a sheen like polished stone, and feels smooth to the touch.

Ethereal Ichor

Ichor which is stretched thinner than the foundations of reality is referred to as etheral ichor, and when properly maintained is functionally an extension of the creator's soulplane, granting them nearly complete control over the space. However, maintaining ethereal ichor without tears against the baseline conscious pressure is exceedingly difficult, often accomplished through the use of an ichor barrier. Together, these form the essential components of plane projection.

Properly maintaining ethereal ichor is considered one of the most difficult skills in firekeeping, as one must be of sufficient refinement and skill to produce ichor which can stretch this far and still hold back reality, and also precise enough to stretch the ichor without tearing the canvas.