A large amount of normal lunar fare

With each other, they produce other rad-ka'ar. With other ka'ar, it follows the mother. With other pseudohumans, it follows the mother. Varies with other races, either halfbreeds or no issue.

Rad-ka'ar have no true flame. They constantly leak radiation. The intensity of the radiation ranges from about elite to supernatural, & they cannot control it. They are immune to normal diseases, & can sense radiation better than most. They also explode when they die. Strong rad-ka'ar split atoms when they die. They can survive in space.

As a member of the outcast groups, they tend to be disdained within ka'ar society. Outside ka'ar soceity they are used either as power plant workers under extremely controlled conditions, or simply put out of their misery.