In 2372, Hastur commanded a task force of six starships, led by the USS Venture, which was dispatched to help defend Deep Space 9 from Klingons during the First Battle of Deep Space 9. The task force also included two Excelsior-class ships and a Miranda-class ship. (DS9: "The Way of the Warrior")
Background information Edit
This character was only mentioned in dialogue.
Presumably Hastur commanded the Venture as the leading starship in the task force.
The name might be a reference to the character from the Cthulhu Mythos.