Dürï

Dürï is the Ïwë-Ïrhïd word for carbon, most commonly in the form of graphite. It is known throughout Ibrófeneð culture, specifically in regards to two properties: its dark hue and toxicity. In fact, the name lends itself to other words like 'Dürïlo' (dark/opaque), 'Dürapar' (Frozen), and 'Dürïŋ' (Dead), most of which survive into later languages like Ariduro.

Being silicon-based organisms, most living beings on the planet are unable to interact freely with it, as mere contact with it for prolonged periods is likely to result in large-scale warping of the affected area. This is due to the compounds formed by the two elements, which are characterized by a much-increased flexibility. For structural elements like the skeletal components, brain matter, and skin, this results in a devastating loss of mobility, function, and structural integrity if the affected area grows large enough. This is called Carbon-Immobilization, or Aparï-Dürïža. Furthermore, if the carbon exposure lasts for long enough, a being, who by then is already dead or very nearly so, can become Carbon-Glowing, or Wëðo-Dürïža, in which its inner functions are so flooded by carbon that its body behaves exactly like a solid piece of carbon, further affecting those who come in contact with it.

Despite its toxicity, Dürï is paradoxically a core part of the Vëtiš-Húrobü, the innermost layer of the leg's anatomy. The large increase in flexibility seems to retain the required durability needed to support the body weight. The supply of carbon needed for this is around fist-sized, so around 20-25 grams, which is dispensed during the Gúfaŋ phase of Ýyorhïsïb. This was discovered in prehistoric times, as evidence of carbon in birth rituals and even solid particles of carbon residue are included in such documents as the Žötó-Ïdhatón. Although the method of dispensing is varied, the danger carbon poses to others means that the caretaker or parent of the child will often choose to dispense the carbon by hand for two reasons. First, the likely infection by Aparï-Dürïža is typically seen as a worthy payment for the successful birth of a new Ibrófeneð. Second, the use of tools, especially those often used for other purposes, results in carbon residue being left on that object, which will go on to cause dangerously-variable levels of infection if not thoroughly cleaned.