Tool Breeder

The Tool Breeders were a posthuman species that evolved from the Swimmers.

Without the possibility to use fire, the Swimmers always adopted other species symbiotically to use them. In this way, they domesticated some creatures even before fully evolving sapience.

Later, this evolved into full fledged genetic engineering, with the tool breeders creating everything they need for their daily life from other lifeforms or later from stem-cells.

Their technological advances include:
 * Hear-like creatures that pump nutritional fluids into living buildings and machines
 * Shell-like buildings
 * Bio-luminescent lights
 * Cephalopod skin-televisions
 * Medical sea-squirts
 * Oxygen-filtering crustaceans for breathing under water
 * Mollusk-derived rifles that shoot out specially-modified fish teeth
 * Brain-augmented hunting-fish hardwired to return kills
 * Living starships