Vendelik served as a private within the Sith Empire during the Conquest of Makeb; he was a male Human.
The son of a mining foreman from Makeb, Vendelik enlisted with the Sith Empire with the purpose of defending his homeworld. He suffered a fatal injury at the hands of Hutt Cartel soldiers, after which a Galactic Republic strike force discovered him. Vendelik communicated to the Republic team that core stabilization required pressure reduction through emergency release valve venting. Seizing control of the main control hub, the Republic team successfully released the significant heat accumulation in the planet's core, providing the necessary time to retrieve the fuel rods.
The character of Private Vendelik appeared in the 2013 expansion pack Rise of the Hutt Cartel for the video game Star Wars: The Old Republic. While his character model first appeared in the game files of SWTOR version 1.3, it was not used in the game until the release of expansion 2.0, titled Rise of the Hutt Cartel.