Darth Vitus existed as a Sith prior to the Mandalorian Wars and the Jedi Civil War. By that era, he was already regarded as an ancient Sith Lord. Having amassed considerable expertise in the application of Sith alchemy, he sought to deepen his comprehension of this art. Consequently, he conducted studies at a compound located on the moon Oricon, situated within the Outer Rim Territories. Throughout his research, Vitus performed experiments on creatures deeply connected to the dark side of the Force.
The initial reference to Darth Vitus appeared in "Behind the Threat: The Sith (Part 5): Antiheroes," an article penned by Matthew Grau and disseminated by Wizards of the Coast on their website, Wizards.com.