Followers of Terror

The Old Republic
The Followers of Terror were formed during Darth Terrifa's war against the Old Republic during 20,000 BBY. When the Jedi froze their leader, they surendered on Coruscant. They later were trapped in the Valley of the Dark Lords.

Reawakening
Millenia later during 1227 ABY, the Followers of Terror were reawakened when Darth Terrifa was released from his icy prison. Reawakened, the Followers of Terror left to devestate the galaxy once again.