The Emperors Bio Weapon.

G R E E N . O O Z E - 

From what little history has been passed down in the oral traditions of the Orcs (It is punishable by death for anyone, especially 'barbaric orcs' to whisper of a time before the Emperor) we know that the first use of Green Ooze was deployed against the people of the United Orcish Tribes to crush their spirit and destroy their homes. The United Orcish Tribes were the last vestige of resistance to the Emperors unification, powerful shamans keeping back the emperors' mage fire while their fearless warriors slaughtered rank upon rank of conscripted soldiers. The elders and most of the warriors knew their fight was a losing one, but the power of Orcish defiance should never be underestimated. The emperor became worried he might see his forces unnecessarily weakened by the mad eyes warriors of the orcish tribes, and began to research ways to deal with the great warrior tribes. 

The answer came in the form of an easily weaponized ooze mutation. Green Ooze. Alchemical Oozes are naturally corrosive semi-living creatures and come in a variety of forms and functions, but Green Ooze is singularly dangerous, so much so, that despite the only weaponized deployment of Green Ooze being used by The Emperor, Green Ooze is now considered a class 1 bioweapon by the Emperors decree.

What makes Green Ooze so dangerous? It's a strongly corrosive, self-replicating ooze that converts all organic matter it contacts, from vegetation and wood to flesh and hide into more green ooze. It's said the emperor used as little as 5 flasks of ooze to destroy the Orcish homelands. By the time the Orcs realized the threat they were facing, the oozes had consumed whole forests, each growing to well over 40' in diameter. And as they grew, emergent predatory behavior began to make itself apparent. The Ooze was no longer content to simply roll across the ground, absorbing whatever wandered into it's grasp. It began to lash out, to seek prey.

  

Within a month the UOT surrendered unconditionally to the Emperor, but not before the death toll had risen to the tens of thousands. The emperor personally ended 4 of the Great Oozes with mage fire, but left the last as a testament to the Orcs, a price for defiance, trapping it in a valley basin. There it sits at the bottom of a once fruitful valley, now stripped bare, as if frozen. It is unknown if Oozes experience biological processes such as old age or death in any meaningful sense, but the Orcs believe the Great Ooze to be at least 300 years old, and it still lashes out to snatch the occasional unwary bird from the sky above it. Waiting, the Orcs believe, until it is powerful enough to eat it's way out of it's prison.