Spaken

The Spaken is an incredibly large jellyfish-like creatures. These creatures are pink floating jellyfish, massive by any standards, that slowly float through the sky. They slowly float down and up in a pattern, and absorb clouds and airborne nutrients. 
They also emit a kind of dust known as the "Druid's Dust", a dust used in enchanting and in potionbrewing which slightly (but significantly) enhances the enchantment's power and the potion's power. These are used to create the Barrels of Longarm Juice, which extends your arms (typically only marginally, but with enough Druid's Dust, it can be significant. 
Things that can be made with Druid's Dust also includes Vitalis, one of the best health potions, Longarm Juice, Fertilius, essentially guaranteeing that a woman will have a child and that a man will produce males, Lankus Optimus, makes you significantly taller, Patrius Optimus (increases strength and increases muscle build for men, can hurt women), Feminus Optimus (increases fertility and loyalty for women), and several more. 
These Spakens float in a pattern that ends up them visiting for 14 years every 119 years. They follow a specific route, deviating very little. It starts near the Peninsula of Ethers, and slowly drifts down through the tribal lands and down through Hue and down through Liaski, finally going up slightly, avoiding the Westerns, and through Gertrudia, and off the coast. 

  These creatures, reasonably, are considered some of the most majestic creatures in the world. The sight of it, as described, is worth traveling millions of miles and risking death for. This doesn't typically happen by anyone who isn't from the Westerns or perhaps Erestria, as it simply isn't worth it, but even peasants and tribals do occasionally travel to see it. Almost all Heroes, adventurers, and merchants nearby try to see it, however.

RARITY: EXTREMELY RARE