Sail Person

The Sail People were a posthuman species that evolved from the Finger Fishers. The developed long skin similar to a flying membrane spanning from their arms and elongated fingers, but unlike some other descendants of the finger fishers, they didn't use it for flying, but for sailing on the oceans of their homeworld.

With their arms used as sails, they developed dual tongues to catch their prey, and later evolved them into manipulative organs to use tools. Because they needed to navigate the endless oceans of their homeworld, they developed a good memory and eventually sapience.

Due to their planat being mostly covered in water and land only existing in form of islands, the populations of the Sail People were scattered and developed many different tribes who mostly went to war with each other. There were nomadic tribes who lived as pirates and warrior societies that fought endless wars, making this species very violent.

Only when one of those tribes developed industrialisation to develop better weapons, they needed a state society to support it. With this came a more enlightened way of thinking and the idea of peace between tribes spread accross the planet and eventually unified the Sail People.

Because of their violent nature, hunting still is a popular sport among Sail People.

They belonged to the third wave of posthumans joining the Second Galactic Empire founded by the Killer Folk and the Satyriacs.

Over a timespan of about 80 million years, the Second Empire developed, through the combined effort of all members, into a galaxy-spanning empire, even though the members never met each other personally, and all of the species colonized other planets.

Though they were prepared to face an alien invasion, the Empire didn't think about an invasion from other posthumans, and so the Sail People, along with all of their cousins, were quickly wiped out by the Gravital as part of their interstellar conquest.