The Tanndai culture is much like medieval European societies in many ways, but there are some extremely notable exceptions. the culture is a combination of matriarchy and theocracy. The Queen is the supreme ruler of the Tann, and the source of all wisdom for them. Any Tann would willingly lay down his or her life for queen and nation. The Tanndai (Techknights) are the queen's elite warriors, at her personal back and call around the clock. The Tanndai follow a code much like the Chivalric code: honor, a desire to defend the weak, and personal bravery are all stressed.

The similarities, however, end there. Tan culture is technologically advanced, and cybernetics are an integral part of their cultural and religious life, with nearly 90% of Tann having some form of cybernetic implants. The Tanndai, chosen at birth by means of religious portents, are ritually cyborged within days of birth and raised in the Queen's palace. There they are trained in the ways of battle and the Code of the Tanndai, but this is not simply education. The Tanndai are actually programmed with these values, creating a level of adherence far beyond normal zeal.

While Eril is not even up for consideration for inclusion in the Alliance (a process which takes months, or more often years), limited contact and exchange of information has been approved. Of the races they have encountered the Tann seem to have hit it off best with their initial contacts, the Eridani. The two races have enough similarities in outlook that they get alone fairly well, though the Tanndai generally consider the Eridani to lack manners, and the Eridani can't understand why such formidable and honorable warriors would waste their time protecting inferior beings.