Xerensien

Xerensien is a fictional chemical element described in speculative fiction and role-playing game materials. It is portrayed as a lightweight metal with unusual redox chemistry and potential for a range of advanced technologies. In in-universe lore, Xerensien was discovered by researchers exploring the asteroid belt of the Epsilon system, and the name is formed from a stylized root plus the common element suffix -ien.

Reported properties vary by source but converge on a metal with high electrical conductivity, good high-temperature strength, and multiple accessible oxidation states (from +1 to +4 in some compounds). Oxides and halide complexes of xerensien are described as stable under extreme conditions, and fresh surfaces may show a pale greenish to emerald tint.

Xerensien ore is said to occur only in trace amounts within exotic ultramafic rocks on a few outer-system bodies, with refined material produced by high-temperature smelting and electrorefining. The element is the subject of ongoing fictional research and appears in various media as a candidate material for rapid energy storage, catalytic processes, and spacecraft shielding alloys because of purported conductivity, corrosion resistance, and radiation tolerance.

Because xerensien is a fictional construct, no real-world synthesis or safety data exist, and its properties are not experimentally validated outside the fictional settings.