The Holocron of Plagueis appears as a Sith synthetic type crystalline holocron device. It is a tetragonal pyramid. The outer shell is formed of electrum, and this coating surrounds the synthetic crystal beneath. Fine wires and laminae penetrate the crystalline matrix. Intricate lattices and vertices store massive amounts of information held secret by the Holocron's Gate Keeper, Darth Plagueis. When word was heard of this artifact existing, members of Clan Plagueis immediately started searching for it. In the end, Scorpius discovered the holocron and the crystal after passing through a series of tests and puzzles.
The Council of the Wise learned that the first tier of instruction on the Holocron is accessible to Equites and focuses on the enhancement of weapons and Dark Armor. The second tier, accessible only to Elders focuses on the genetic engineering and enhancement of sentient creatures. The third and final tier remains shrouded in secrecy, though rumors state it is a pathway to the most secret of powers created by Darth Plagueis.