According to the myth, etherium was created by the sphinx Crucius, and since then most of Esper's inhabitants have parts of their body replaced by etherium. The body's functions are kept up through a series of complex enchantments. The stocks of etherium are measured in rods. Ultimately the Ethersworn are planning to fuse every living being with this metal. The greatest masters of the craft abandon tools all-together, shaping the metal with hand and mind alone.
The inhabitants of Esper believed that all life and every physical form was incomplete without some connection to the Aether via filigree or etherium fusing. As they could not create new etherium themselves, their supplies of it were very limited, so mages began to use more subtle fusions with lower-class life forms.
It is unknown how Crucius made the alloy; even Sharuum could only show how to thin existing etherium. The Seekers of Carmot believed that the substance was made from the materials known as sangrite and carmot. They possessed the Codex Etherium, which supposedly reveals the location of both; however, it was revealed by Tezzeret that the Codex was a fraud.
Sangrite, a magical bloodstone that stores the lifeforce of creatures that have died, was revealed to be the petrified blood of a dragon who dies in battle and can only be found on Jund, thus explaining why the Esperites could not craft new etherium. As Crucius was himself a planeswalker, he could obtain sangrite from Jund.
Tezzeret and Nicol Bolas fought over mining rights on an unnamed plane, where Tezzeret claimed the ores needed to create etherium came from. It is unclear if this was on Esper, Jund, or some other plane.
After the Conflux
After the Conflux, the Seekers sent emissaries into the other shards, seeking carmot at any cost. It was revealed by Tezzeret that he was the Carmot, but it is unknown whether he meant only himself, all Esperites, or humans in general.
- Doug Beyer (November 19, 2008). "Perfection through Etherium". magicthegathering.com. Wizards of the Coast.
- Magic Arcana (November 19, 2008). "Filigree Art Quiz". magicthegathering.com. Wizards of the Coast.
- Magic Arcana (September 18, 2008). "Sketches: Ethersworn Canonist". magicthegathering.com. Wizards of the Coast.
- Flavor text for Etherium Sculptor
- February 4, 2009. "[[Webcomics|Magic Webcomics]]". magicthegathering.com. Wizards of the Coast.
- Test of Metal
- Agents of Artifice
- Doug Beyer (March 04, 2009). "An Etherium Tale". magicthegathering.com. Wizards of the Coast.
- Magic Creative Team (October 26, 2016). "It's Time to Talk Commander (2016 Edition)". magicthegathering.com. Wizards of the Coast.
- Magic Arcana (September 29, 2008). "The Filigree Texts". magicthegathering.com. Wizards of the Coast.