Wiktionary
powermonger
n. A person who wields power in a tyrannical or irresponsible fashion.
Wikipedia
Powermonger
Powermonger (or Power Monger) is a real-time strategy game developed by Bullfrog in 1990, derived from the Populous engine but presented using a 3-dimensional game map.
Usage examples of "powermonger".
As a result, the powermongers were not troubled by him and were too lazy to challenge the areas where he was strong.