Vannadan
Vannadan the Firebrand was an Imperial demagogue who commanded the Sons of Vannadan Chaos Cult.[1]
In the wake of the Great Rift's creation, Vannadan convinced thousands of the Imperium's citizens to turn to heresy and embrace the Chaos Gods. The wider Imperium was unaware of this, but the Eldar of Craftworld Saim-Hann knew and saw that Vannadan would eventually bring about a disaster on the Imperium world Vigilus. In order to spare the world, the Craftworld dispatched a strike force to assassinate Vannadan and, though they were successful, the Imperium saw this as an unprovoked attack by the Eldar. The Saim-Hann strike force soon came under attack from Imperial forces and many of the Craftworld's Eldar were slain before the strike force was able to escape. In the wake of this massacre, the Craftworld sought revenge for the lives that were lost at the Imperium's hands and the Spiritseer Qelnaris led another strike force to invade Vigilus.[1]