Shimmerplume of Achillrial
The Shimmerplume of Achillrial was a helm that was created by the Craftworld Féin-Cineál and it was given to Achillrial, upon becoming one of the Eldar's first Autarchs. The helm could capture light itself and its resplendent plume reflected colours like a sun-splashed prism; which greatly aided Achillrial in combat. The helm was able to blind Achillrial's enemies, preventing anyone from besting him in close combat, and although the helm's radiance drew an inordinate amount of the enemy's fire towards him, no shot could fell the Autarch. It was ultimately treachery however, that bested Achillrial and led to the downfall of his Craftworld. Now nothing remains of Féin-Cineál except the Autarch's helm, which is how it became known as the Shimmerplume of Achillrial.