The next installment in the “Tales of the Jedi” series is “Dark Lords of the Sith.” This story-line deals in part with the rise of Exar Kun, a sith lord who, initially a promising Jedi apprentice (or “padawan”) starts to fall under the influence of the Sith Lord spirit of Freedon Nadd, who has already corrupted the heirs of a powerful system into creating a Sith cult, and causing an insurrection against the Republic. Ulic Quel-Droma, attempting to infiltrate the cult after the death of his master during the conflict, instead falls to the dark side and joins both them and Exar Kun as a dark lord of the Sith.
The two Sith Lords wage a war with the Republic in “The Sith War”, with the help of Mandalore and his warriors (a sort of more ancient-looking Boba Fett). 
There’s a few interesting things here. Kun’s base of operations is the Jungle Moon Yavin IV, which will later play a key role in the films as the base of the Rebellion in both the original Star Wars and the upcoming Rogue One. Turns out those temples on the planet are Sith Temples (Although a lot of this is no longer canon).
Kun also, when attacking Coruscant, wields a double-bladed lightsaber, something that would show up in the films proper a few years later with Darth Maul’s weapon in The Phantom Menace.
Eventually, Ulic Quel-Droma is confronted by his brother Cray, and Ulic ultimately slays him, stunning him back into the light side and turning him against Kun. However, he is stripped of his ability to use the force by his fellow Jedi. Kun is eventually defeated, but he decides to undergo a sort of ‘scorched Earth” tactic as a last resort. The ritual however traps his force ghost in the temples, where he will re-emerge in the “Jedi Academy” trilogy (Years later, Luke sets up an academy on the planet, unaware of it’s Sith connections).
The “Tales” saga would continue 2 years later in 1998, but Dark Horse would focus on new projects the coming year, including adaptations of several novels, as well as a series focused on R2-D2 and C-3PO, but independent from the old “Droids” cartoon.
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