Battle of Fortress Vader

The Battle of Fortress Vader was fought on the planet Mustafar at some point during the reign of the Galactic Empire when an army of Mustafarians, led by Father Kkkt, rose up to save what was left of their homeworld after Darth Vader caused the planet to scream as he built his castle, Fortress Vader. During the battle, Vader proved a challenge to the Mustafarians, but Kkkt and the other chiefs used the Force to flood the battlefield with lava.

The Fortress Vader Imperial garrison was wiped out, with only Vader surviving. He retreated to the fortress as the remaining Mustafarians tried to destroy it and used the energies of the dark side locus under it to wipe the army out. With the Mustafarians dealt with, the Sith Lord Darth Momin confronted Vader in the focusing chamber to kill him. The two fought and Momin badly injured Vader, but was then crushed by a stone. Now alone in the fortress, Vader opened the door to the dark side of the Force and entered it.

Text and facts from the “Battle of Fortress Vader” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.