The scourge of greenskins
Armageddon was one of the most important industrial worlds not only of its sector, but of the entire Imperium. For many years this world has been under constant siege by the Orks. The green tide has been sweeping Armageddon over and over again and perhaps it would have been destroyed, but there was one hero who stubbornly resisted this fate.
Commissar Yarrick is a hero of the Imperium, who has been commanding the Armageddon defense in three wars against Orks. His tactical genius allowed him to win many battles and even Ghazghkull Mag Uruk Thraka himself, the leader of the Greenskins Waaaaagh, rated Yarrick as a worthy opponent for a good fight.
Commissar Yarrick is a Scourge of Greenskins. And if he appears in your army, for sure you will get +100 luck in the game against the Orks.