Spectrum, known scientifically as thaumachium and in some circles as "cold iron", is an icy-coloured metal manufactured from thaumarchite ore. Historically, it was used in Oceanyka for wards, religious artifacts and esoteric art, as well as for some weapons with religious significance. With the discovery of psionics as an esoteric field of science, it was also found out that thaumachium-based alloys, including spectrum, have a disruptive effect on all psionic activity. The effect is proportional to the object's mass; a spectrum-tipped projectile may disturb a psionic field, while a longsword made of said material would completely plunge through.