Changes

Due the developments at [[Prospero]] the rebellion would be further be strengthened by [[Magnus the Red]] and his Legion, the [[Thousand Sons]], servants of [[Tzeentch]]. Horus had nine Space Marine Legions and had all but destroyed three loyal ones. The way to [[Terra]] was wide open, and the [[Battle of Terra]] would follow.

The system/planet's name is alternatively spelled '''Istvaan'''³.