Auramite is a material of unknown provenance but extraordinary resilience used to construct the customised, golden suits of power armour known as Custodian Armour worn by the Adeptus Custodes, the bodyguard of the Emperor of Mankind, as well as the golden plate armour of the Emperor Himself. It is said to be similar in composition to the heat-and-shock-resistant ceramic synthetic known as ceramite used in the crafting of Space Marine and all other forms of Imperial power armour.
Auramite is an incredibly rare substance, whose natural colouration is a shining gold, a hue entirely appropriate for the Emperor's personal guardians. However, through closely guarded alchemical processes, auramite can be tinted, or its colour changed altogether on a molecular level. It is a costly and painstaking process, but considered far more suited to the Custodians' importance in the Imperial hierarchy than simple repainting.
Auramite is almost inert at a quantum level, making it far less of an inhibition to the manipulation of Aetheric energy by a psyker than other protective materials. During the Siege of Terra, the Emperor wore His own auramite battle-plate while fighting His immaterial battle with the powers of Chaos within the Warp. Bare skin is better when unleashing psychic power, but had the Emperor not worn it, the immense energies He unleashed while sitting upon the Golden Throne would have burned His flesh to the bone.
Sources[]
- Master of Mankind (Novel) by Aaron Dembski-Bowden, Ch. 3
- The First Heretic (Novel) by Aaron Dembski-Bowden, Ch. 7
- The End and the Death: Volume 1 (Novel) by Dan Abnett, Part 1, Ch. 1
- Codex: Adeptus Custodes (8th Edition), pg. 22
- Codex: Adeptus Custodes (9th Edition), pg. 16