The Hajira are a race of genetically engineered humans, who were modified to pass on memory through genetic material. That way, their offspring will know what they knew at the moment of the child's birth, and back through the generations.
The Hajira settled on the planet Serendipity and remained isolated from Known Space. Overtime, their technology withered to nothing. The Wayists rediscovered them and began converting them. However, they were also the target of slavers led by Ursari. Dylan Hunt tried training them with force lances but their Wayist monk, Thaddeus Blake, destroyed them before the battle. Tiama, one of the Hajira, injected herself with Rev Bem's DNA so a new generation of Magog Hajira would be born and protect them.