Second Imperium

The Second Imperium was a hoax created by four of the Emperor's Royal Guards using holograms of Palpatine. The Imperium used their "Palpatine" to use the Shadow Academy to destroy the Jedi, but the plan failed when Brakiss discovered the deception and killed three of the guards. The fourth activated the Shadow Academy's self-destruct systems, and the Second Imperium was destroyed forever.