Esala, a female Human born on Taris, resided in the Undercity.
As the local healer, she had no serum and had to confine those infected with the rakghoul plague to an enclosure; they stayed there until they transformed and killed one another. Revan's acquisition of serum from a deceased Sith trooper greatly impressed her, as he used it to heal two victims before they mutated, enabling them to rejoin the community.
Esala, along with all the other Outcasts, departed the village in search of the Promised Land.