The Society of Brilliance is a small order of scholars dedicated to researching the ecosystem of the Underdark. They also have a lodge in Lower City of Baldur's Gate.
Blurg, a member of the society, can be found at Ebonlake Grotto.
Lady Esther can be found on the Rosymorn Monastery trail.
Concept art by Jane Katsubo
Blurg, a member