The civilization transformed almost overnight (about 50yrs) from the dark ages to almost futuristic. Because of this, everything is constantly being retrofitted resulting in a historical yet futuristic look.
Since the collapse (or sundering) of the past technologically advanced civilization the world reverted into being controlled by regional governors many of them war lords. Almost everything was lost from the past yet there are plenty of megalithic artifacts to attest to the wonders of the lost epoch.
An archeological dig surfaced a treasure trove of knowledge (some artifact for the industrial design purposes). The lead scientist wanted to use the information for the betterment of all, but his financers saw a potential for profit and they formed a corporation.
The creature is secretly being used as an energy source that is the basis of their technology.
Since the company controlled the new technology and because nobody existed to keep it in check, it quickly consolidated its power of the homeland.
There is a minor resistance from those who are suspect of the technology. Together with the threat of the creatures and the resistance, the company is forced to employ a strong military.