Codex Etherium

From MTG Salvation Wiki

The Codex Etherium are a series of items under the possession of the Seekers of Carmot which supposedly reveals the location of carmot, a substance that they claim is crucial to the creation of new etherium. However, Tezzeret discovered that the pages were blank, and the document a fraud.

This may be connected to Nicol Bolas's connection to the Seekers.