The Kyekna are a species that evolved in OE 42,585,739 on the planet Kenaklesh, all extant civilizations run by the species were united into the United Kyekna Monarchies transforming the Old Era into the United Era. The Kyekna are isopterid, insectoid arthropods with a eusocial caste system, resulting in significant variation in size and shape between castes.
The worker caste is designed to be versatile and utilitarian. The worker Kyekna have large, bulbous cream-colored bodies and small, round, amber-colored heads. Workers have durable, powerful mandibles capable of sawing through lumber and rock, but these jaws are not built for combat purposes, and to compensate for their lack of offensive power, workers' rotund bodies are swollen with a large sac that spews out toxins if it's thick membranes are pierced by the stingers, claws, mandibles, etc. of a hungry predator.
The soldier caste is built to defend the colonies of the Kyekna from attacks by predatory groups. The soldier caste has a cream-colored bodied that is more muscular and armored than that of the plump worker caste, and a large, somewhat oblong, and amber head that stores the large muscles necessary to power it's sharp warlike mandibles, which they can snap shut at alarming speeds.
The soldier caste has much thicker exoskeleton armor than the worker caste, and more carapace plates than the worker; The soldier caste also has a fontanelle which can fire off a spray of a highly acidic, silvery substance, but it's high spread makes it inviable as a long-ranged weapon.
Nasutes have a black head and lack mandibles, they instead have a nasus through which they absorb liquids. The nasute is a defensive class and can fire out a fast, powerful shot of acidic venom containing neurotoxic peptides.
Generalists possess both a set of mandibles and a nasus, but excel over soldiers and nasutes respectively with neither;
The basher cast is similar to the soldier, but it's head is more ovular and long, and it's mandibles may appear distended and mangled beyond recognition due to a complex specialization; The basher's mandibles are not meant to clamp down on a target, but instead to rapidly spring outwards and knock them away.
A caste of soldiers designed specifically to guard the kings and queens of Kyekna colonies, they are similar in appearance to soldiers, but have jet-black exosekeletal armor and are somewhat larger and more powerful than ordinary soldiers.
Alates are winged reproductives that may go on to become Kings or Queens one day if they breed, but are produced only once every few decades. Alates are capable of flight. Alates, after mating, become Kings and Queens, which are the only Kyekna capable of breeding.