Karis Tribe
The Karis Tribe was a tribe from Delios VII. Their shamans practiced a ritual that increased the electrical resistance of their skin, allowing them to resist the plasma discharges that occurred inside their sacred caves.
Kathryn Janeway thought that perhaps a similar process protected the monks of the Nechisti Order from the biogenic field around their shrine. (VOY: "Sacred Ground")
This tribe was only mentioned in dialogue.