Castrovel is humid and humming with life, its thick blanket of atmosphere trapping the sun’s energy and making the surface a lush, steamy paradise. Jungles abound here, full of great broad- leafed trees that sometimes stretch several hundred feet into the air, with branches large enough to support a house, or else cluster in masses so thick that the sun can barely penetrate to the floor of strange and primeval swamps, where gnarled mangrovelike roots form whorls and hollows housing all manner of creatures. Oceans of coloured mist and gas vie with more conventional seas to provide habitats for innumerable species, from cannibalistic selkies and schools of semi-intelligent fish to the elephantine isopods that trundle across the sea bottom, the cracks in their glowing armour providing safe havens for delicate seahorselike symbiotes. Given the sheer amount and variety of life on Castrovel, it’s small wonder that legends of “the Green Star” often associate the world with lust and fertility.
Worship of the elvish pantheon originated on Castrovel and was carried to Golarion. The worship of Irori is common among the formians but almost unknown elsewhere on the planet.