The 68th Deltic Lions are well known for their ability to endure some of most toxic worlds in the Imperium. Indeed, numerous noxious quagmires have proven to have little effect upon their bodies. Where other regiments have perished upon planets ravaged by plagues, the Deltic Lions have survived some of the most virulent contagions in the galaxy. Their renowned immunity has led to them regularly being summoned when the Inquisition's Ordo Malleus suspect the minions of the Plague God, Nurgle, are at work in a war zone. However, their resilience against disease has also made the 68th Deltic Lions objects of curiosity for Grandfather Nurgle himself, and he often sends his Daemons to investigate the Scions in this uniquely horrifying manner.