ソウルエッジ
His profile in "Soulcalibur III" reveals that during one of his periodic visits to the "Pit", Voldo found the tomb ransacked and the sword he mistook for Soul Edge stolen alongside the fragments he collected in his travels. Since the thieves were apparently interested in Soul Edge, he decided to track them down and force them to reveal any information they may possess regarding the sword. He also came to realize he was eventually going to die and leave the pit unprotected, so he began to search for a worthy successor as well. During the events leading up to "Soulcalibur IV", Voldo managed to locate Soul Edge at Ostrheinsburg, resting in the hands of the Azure Knight. After finally claiming Soul Edge for his master, a familiar voice spoke to him, instructing him to protect Soul Edge. However, the voice belonged not to Vercci, but Soul Edge, which assumed his form in Voldo's mind. But after he was set free from this illusion, Voldo returned to the pit to find it ransacked. He then went on a rampage and murdered every thief to return the treasures. Seventeen years later, Voldo once again served Nightmare, who had disguised himself as Graf Dumas.