Primion is a planet that is just beginning to have life higher than early fish and reptiles. Two races have crawled out of the soup in the swamps: The cayma and the muckdwellers. These two races are still in very small numbers (not to mention very small themselves), and compete for living space and game.
Primion is a swamp-filled planet, the ground muddy and full of sinkholes and deep pools of muck. There is one great sea on Primion, located on the equator and surrounded by miles of swamp. Nothing but simple fish lives in the sea.
Primion is a very warm and humid planet, with an atmosphere that is slightly uncomfortable to breathe for most creatures (but it can still be used--treat as 1/4 less air than the ship would normaly have). The great sea is vast and warm. The surrounding swamplands are humid and the little vegetation that grows are generally trees with palm-like leaves. The cayma use woven pieces of bark to make whipstaves (dmg 1d3/1d2) to use in battle against the muckdwellers or when hunting for game. These staves look like normal staves (but cayma-sized), but are springy and flexible.
There are no ports of call on Primion, because neither race has advanced that far. Adventurers landing on Primion are advised to land in the Great Sea, for neither the warring cayma nor the muckdweller goes there often. Landing anywhere else is also difficult because of the uneven terrain composed of mud pools and solid patches of ground. If an adventuring group stumbled upon a cayma or a muckdweller, it could be convinced to join the ship, but muckdwellers must be kept moist and will get very grumpy without a mud pool; cayma are hyperactive.
Primion boasts very little of interest. A cayman whipstave could be sold to other races as a curiosity for a sum of 1gp. They can be used as a weapon by M-sized races or smaller (larger races can use them, but they might as well just use their bare hands instead). The wood on primion can be taken for lumber, but there aren't a whole lot of good trees--most of them grow in every which-way. The Great Sea is freshwater, not salt water, and so it can be used for drinking. Cayma and muckdwellers can be captured, but make poor slaves (cayma are only 1 1/2 feet tall, as are muckdwellers. Cayma spaz out alot, and muckdwellers' arms are too weak to manipulate simple tools, let alone carry out other tasks).
The cayma and the muckdwellers live in small tribal communities, and whenever they encounter the other, they jump to open warfare. Muckdwellers are detailed in the Monstrous Manual, cayma are a race of dimunitive lizard- men from the Savage Coast. On Primion, the cayma look much like frilled lizards, and whenever they get excited (which is anytime they're not dead) their frill goes up.
If the DM wishes to make PC cayma or muckdwellers, cayma can be fighters, thieves, or mages (yes, Mages!). Muckdwellers can be fighters or thieves. Muckdwellers don't like magic, and for their sakes cayma mages are VERY rare.
