Vader 4's spirit attacked Vader 3 when he was captured by the Dark Force Creature in 172 ABY. But the Light Force Creature intervened, saving Vader 3 and knocking the Dark Force Creature back into his realm. However, Vader 4's spirit survived and was soon transferred into a new body with Beskar Armour, which he used to attack Vader 3 in the Outer Rim. Vader 3 managed to beam back to the Starship Rebellius, but soon realized that his Quantum-crystalline armor was no match for Vader 4's beskar armour. So Vader 3 spent some time upgrading his armour to beskar specs so that he would be better prepared to face Vader 4 for a rematch.