Codex: Chaos Daemons (2008), p17-18 — Daemon Invasions

On Galdemor, the violence committed by the Daemon legion of Braskh'har the Devious, a Herald of Slaanesh, saw thousands slaughtered and caused such grief that a new Warp rift opened, spilling forth the armies of Khal'thar'rak the Bloodied Fang and a host of necrotic Nurgle Daemons led by Prince Gurglish the Ever-Rotting. The three armies fought over the spoils of the world and left no creature alive by the time they eventually departed back to the Realm of Chaos.