How did Darth Vader fought Darth Maul in Star Wars Legends?

In the Star Wars Legends narrative, the duel between Darth Vader and Darth Maul is depicted in the non-canonical story from Star Wars Tales #9 and detailed in several sources:

Setting and Context

The duel takes place on the moon of Kalakar Six, just before the Battle of Yavin. Darth Vader is lured to this location by false intelligence about the Rebel Alliance's plans for the Death Star, which was actually a trap set by a group of dark side cultists known as the Prophets of the Dark Side. These cultists, who disagreed with Darth Bane's Rule of Two, had resurrected Darth Maul using Sith alchemy to create a new, supposedly superior apprentice for Emperor Palpatine13.

The Duel

Upon arrival, Vader encounters the resurrected Darth Maul. The cultists reveal that they have brought Maul back to life because they believe Vader is unworthy to serve as Palpatine's apprentice due to his past as the Jedi Anakin Skywalker. Maul, now resurrected, challenges Vader to a duel to determine who is the true apprentice of Palpatine.

The duel is intense and evenly matched, with both combatants exchanging blows and showcasing their mastery of the lightsaber. Maul taunts Vader, claiming that Vader still has a spark of light within him and is not a true Sith. Vader, however, insists that Anakin Skywalker is gone and that he is fully committed to the dark side.

Turning Point and Conclusion

During the duel, Maul gains the upper hand, slashing Vader's belly and exposing his cybernetic internals. However, Vader refuses to yield. In a final, desperate move, Vader uses the Force to ignite his lightsaber and stab himself through the stomach, also impaling Maul. This act of self-hatred and sacrifice allows Vader to kill Maul, who disappears into the lava of the volcanic environment13.

Aftermath

After the duel, Vader confronts the cultists, only to find that they are killed by Palpatine, who appears and dismisses the cultists as heretics. Palpatine is not surprised by the resurrection of Maul and is pleased with Vader's victory, reaffirming Vader's position as his apprentice13.