Esiuk is a Rshani curae currently retained by the house of Camira-Druz in Rshan. Like most Rshani physicians, he is a Setna as well. Esiuk shaves his head bald in the traditional manner for healers, probably to emphasize a kinship with the mysteries and powers of the Ancients, to which the Setna are closely tied.

Esiuk is about over a hundred years old and is described as intensely interested in Hilurin magic.