Nahiki

The Nahiki are a race of greenish parasites that live in the throats of their chosen hosts. They seem to be fairly populous, the group having run into a fair number of them across their travels. Many of them have been hostile towards the group, including the one in control of Darrin in Presco.
Assumedly they have some relation to the Tazza'Khool, who are similar in nature, but act as more of a hive mind rather than as invididuals.