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Confirmed magical/mythical beings and/or creatures in Militiregnum's history would include:
Trolls
Goblins
Dragons
Dwarves
Elves
9-Headed Man-Eating Sheep-Bears
Meabers
Snorkeling Cactus Weasels
Sea Monsters
Chatreeleons
Wraiths
Beaster Bunnies
Gazillion Headed Hydras
Space Pigeons
Then there are things that mostly live on other planes like Faerie which however touch onto their world in Militiregnum. For instance, you might meet Fairies who made their way to Britay and in Elepharia you may encounter spirits, the Alnnar Desert would often house Djinni. In Daiyanti you'd probably find Youkai, Kitsune and other Japanese things, and everywhere you go you'll meet the native versions of their spirits, demons, ghosts and grims, and the like. These include, but are not limited to: kelpies, pixies, nymphs, satyrs, sirens
It is also worth noting that many of these creatures are becoming rarer with the modernization of Militeregnum under the rule of thedude, though they were still rare beforehand. Many mentioned here are rarely seen, and the common man considers these as only tales.