Vermilion, a male individual, operated as a bounty hunter throughout the Galactic War, a conflict fought between the Galactic Republic and the newly powerful Sith Empire. His gender is male, as noted here, and his profession is detailed here. The war he participated in is described here, along with the involved factions, the Republic and the Sith.
The Empire contracted him in 3640 BBY to find and kill Selonians who were part of the resistance during the battle that took place on Corellia. The year is specified here. To accomplish this task, he used specially programmed war droids designed to target any Selonian located in the Coronet City area. These events took place during the battle on Corellia. When Lachei discovered the command unit for these droids situated in the tunnels beneath the shipyards, Vermilion and his team confronted a Republic strike force. Ultimately, the Republic team prevailed, defeating Vermilion and neutralizing the threat he posed. Lachei is mentioned here, and the city is described here.