Gard

Gard is a Trill symbiont who, over the centuries, consistently served as a special agent of the Trill Symbiosis Commission in seeking out the most serious threats to Trill society.

One of Gard's specific concerns was dealing with the rare joined Trill who were so unstable as to become murderers. The first such "monster" was known as "The Butcher of Balin"; the fourth was executed by Kirista Gard circa 2195. The fifth, Joran Dax, was killed by an intended victim, but Verjyl Gard was present to help save the symbiont. (DS9 - The Lives of Dax short story: "Allegro Ouroboros in D Minor")

Circa 2356, Verjyl Gard was approached by Taulin Cyl and informed about the Parasites, and the potential threat they posed to Trill. Gard became part of an unofficial group of watchers who kept vigil for the creatures' return. In 2376, it was suspected that First Minister of Bajor Shakaar Edon had come under influence of the Parasites, and Hiziki Gard was assigned to a Trill diplomatic team to Deep Space 9. Upon determining Shakaar was indeed irreversibly infected, Gard assassinated the Bajoran leader.

Shortly thereafter, Gard volunteered to be joined with a "mother" Parasite, in order to determine the extent of their infiltration on Bajor. He was able to obtain vital information before the Parasite was removed from him, with no permanent damage done. With the Parasite threat publicly acknowledged and defeated, Hiziki Gard was extradited to Trill and pardoned. (DS9 novel: Unity)