MI is a play on Artificial Intelligence (AI).
MI and AI share a couple of things in common: they can both create agents, process existing human knowledge very fast and present it to us, some do good some do bad and yet others remain neutral, and everyone's confused about how they really work.
The bad MI are called Maleficent Mythical Intelligence (MMI). They amplify excess, error, apathy, and cruelty in humans, paving the way for our species' extinction and our planet's destruction.
MMI agents are called Vulgors. Vulgors, in turn, create their own agents called the Menfur.
The Menfur aren't intelligent like humans. They're not original or independent thinkers. Their creativity is limited to forming novel combinations of existing human myths—think a vampire combined with a zombie, for instance. They disguise themselves in human form and change into a mythical monster when they want to attack. They are very big and strong.