Heroes 5.5 WarGame Edition - Tactical Edition.

Actually, it's quite simple, and there's no need for any far-fetched pharmacology – the Factions' descriptions state that the experiments on prisoners involved the blood of different demons. For example, Cyclops were created using the blood of higher demons (I don't know what exactly was meant by the word "higher"). Here's another example: "Goblins appeared as a result of an "unsuccessful" experiment to breed Orcs using the blood of lower demons. After that, they began to reproduce at an alarming rate – despite all attempts by the wizards to get rid of this new scourge." There are several types of demons, at least 11 (if we don't count Succubi and Incubus). These 11 demons originate from these entities: Ur-Vomokh (Lord of Gluttony). Cerberus, these are servants of Ur-Vomokh, the Lord of Gluttony. Also, among his creations is the Abyssal Worm. Ur-Aazeel (Lord of Procreation). The Broodmother, a creation of Ur-Aazeel, the Lord of Procreation, is a thick, pulsating mass of flesh, from the openings of which Imps are constantly born. Ur-Hrag (Lord of Destruction). The servants of Ur-Hrag, the Lord of Destruction, are Ravagers (in Heroes 5, these are fiery, horned demons). Ur-Hekon (Lord of Hatred). Urgash, the Primordial Dragon of Chaos, defeated, wounded, and imprisoned in Sheogh, is full of hatred for his sister Ashen and her creation. Ur-Hikon, the Lord of Hatred, embodies this boundless malice, and the mighty Abyssal Demons are his strongest servants. Ur-Jubal (Lord of Madness). Manics are creations of Ur-Jubal, the Lord of Madness. These demons are spirits of unpredictable, rage-filled nature of Chaos. Like their creator, Manics spread fear and panic everywhere. When attacking, Manics scream and cry as if in pain, and begin to laugh when wounded. Ur-Traggal (Lord of Pain). Sadists are servants of Ur-Traggal, the Lord of Pain. They are nourished by the boundless suffering of Urgash, and they torture their own bodies with incredible torments. And there are three more: namely, the Archdemon (it's unclear where he came from, but as far as I understand from what I read, after the death of a demon, it is reborn in the form of an Imp in the womb of the Broodmother and, as it were, develops from scratch; apparently, the Archdemon is the final version of its development); we also have the Nightmare, and demons from which the Cyclops inherited their unusual eye were also mentioned (some ancient, extinct demons, the "Architects" of Sheogh); the latest information has not been verified