So like one million years ago that guy from Monsters & Manuals wrote an interesting blog post about generating a campaign setting. The rules were to grab a monster manual and randomly select 2d6 of them. I only rolled a four (which I pouted about) but here are the monsters I got.
Iron Golem were created by the eponymous wizards of Ruined By Wizards Dying Planet Death World, and many of them still work mindlessly, carrying out ancient tasks left behind by their creators. Those with enough independence and a sense of identity work tirelessly to unravel the secrets of their creation, in a seemingly vain attempt to allow the golems to reproduce and continue their species. The iron golem villages are isolated and hidden by the poisonous and toxic areas of Ruined By Wizards Dying Planet Death World. They have no need for agriculture or livestock, and they spend their time researching magic, excavating ruins, and building thousands upon thousands of lifeless bodies for the eventual day they learn to instill life.
Chimera are apex predators in Ruined By Wizards Dying Planet Death World, and hunt the lifeless, rusted mountains for prey. They are only roughly communal, and set up wedge shaped hunting ground allotments to allow individuals to avoid contact when they wish. Each head speaks a different language and thinks independently from the others, so even though they may move like graceful hunters, a conversation between two chimera is a babble of six voices. They don't write or build tools, but they have an intricate oral tradition of history and law. They can also cast spell, even three spells at once, but only so long as the spell only has vocal components. The cheerfully eat both dragonnes and minotaurs.
Dragonnes act exactly like every fairy tale about talking cats. They're all smug and nosey and arrogant. They were a wizard weapon created out of a lion and a bronze dragon, which seems like a silly idea, but, you know, wizards. They live in the lowlands, avoiding the mountainous regions the chimera hunt in, and the ruined cities full of tentacled abominations and eldritch death engines. They have a simple runic language, but do not build tools or structures. They travel in packs which have fierce and impossible to understand social structures, and tend to settle near minotaur towns. Occasionally dragonnes and minotaurs will cohabitate, with the minotaurs providing structures and livestock, while dragonne packs hunt for food and act as a defense against lone chimera.
The minotaurs were created to be brutish foot soldiers in the wars that created Ruined By Wizards Dying Planet Death World. Years of freedom, however, have allowed the minotaurs time to practice meditation and philosophy, so now they're all super zen and calm all the time. The minotaurs avoid chimera, but sometimes trade labor to the dragonnes in exchange for food. They build villages and cities out of the broken masonry and rusted supports of the world before, and raise what crops they can in the ashy soil of Ruined By Wizards Dying Planet Death World.