Oro Dassyne served the Corporate Alliance as a Koorivar soldier, leading the red-armored Koorivar Fusiliers. He protected their interests with the troops under his command. As the Clone Wars began, pitting the Galactic Republic against the Confederacy of Independent Systems, Dassyne chose to fight for the Separatists and became a general, while still leading the Fusiliers.
The character of Oro Dassyne was originally cited within the current Star Wars canon in Rise of the Separatists. This book was a 2019 expansion for Fantasy Flight Games' Star Wars Roleplaying game line. Within the Star Wars Legends timeline, Oro Dassyne made his debut in the Star Wars: Clone Wars animated show, specifically the twenty-second episode. This episode was broadcast on March 25, 2005, and he was initially referred to as simply "Alien General." His proper identification occurred later in his entry on StarWars.com's Databank, which was released by 2006.