Rise of The Tau
An alien race from the Warhammer 40,000 setting. They are an ally race of the Tau Empire, a race of explorer/conquerors. They only appear in the game Battlefleet Gothic, specifically Dhow space craft.
Dhows are small yet elegant yachts propelled by the psychic powers of the Nicassar. Nicassar have psychic powers, mostly telekinesis. Their ships have no interstellar capacity, and the are reliant on the Tau for this.
Alternatively, they will travel slowly for centuries while in hibernation. Often for a longer journeys a Nicassar family will join together to form a larger community, with crew alternating between hibernation. The race lives entirley in space, and have adapted survive in the void at the cost of being unable to thrive on planets with a high gravity.
The Nicassar are driven by an insatiable curiosity to explore and travel, becoming semi-nomadic and most content only when traveling. They were first outside race to join the Tau Empire.
They are very slow to act, but very wise. Much like Ents from Lord of the Rings, the running gag is that the Nicassar are so slow to act that they where conquered before they even realised the Tau had turned up.
They resemble very flat, very thin polar bears, that float about on waves of Telekinetic power.