This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
The Kwejian were a pre-warp civilization until the 31st century. The Burn shifted the orbit of Kwejian's moon, which changed the planet's tides and caused vast numbers of sea locusts to emerge from the ocean and devour the Kwejian harvest. Facing the starvation of millions, the Kwejian accepted a deal from the Emerald Chain to exchange their trance worms for a sea locust repellent. Kwejian scientists worked for years to find another way to deal with the locusts, without success.
In 3189, Emerald Chain leader Osyraa withheld the sea locust repellent to pressure Kyheem into delivering his brother Cleveland Booker to her. In response, the USS Discovery arrived at Kwejian and confronted Osyraa's flagship Viridian. Osyraa opened fire on the planet, but was ultimately forced to withdraw after the Viridian was disarmed by Booker's ship. The Discovery crew then devised a means to amplify the electromagnetic connection between the sea locusts, allowing Booker and Kyheem to combine their empathic abilities and persuade the swarm to return to the sea. (DIS: "The Sanctuary")
Kwejian physically resembled Humans. Infrequently, some of them exhibited the empathic ability to influence plants and animals; Booker described the appearance of such individuals in the gene pool as a result of "balance". Kwejian empaths activated their ability with a ritual chant, during which a glowing pattern appeared on their foreheads. The pattern could also appear in moments of strong emotion. (DIS: "That Hope Is You, Part 1", "The Sanctuary")
Society and culture
The Kwejian resided in an area of their planet called the Sanctuary, which was protected by a sophisticated defense system and ruled by the Steward of the Sanctuary. Common Kwejian gestures of affection included clasping one another's forearms and touching their foreheads together. A gesture of goodbye was to touch their foreheads with the fingertips of the right hand, then turning that hand outward. Their language was written vertically. (DIS: "The Sanctuary")