Vale's suspicions about Mennena's true situation weren't just a pure guess. It was also with the help of the Arcane Bureau, which had been using Mennena's abilities to complete their various missions.
After very long research and learning about Mennena's desire to acquire the Golden Key, they pieced together that she was most likely planning to save her main body in the Prison Realm. It wasn't too surprising since they all could tell that her strength was too powerful and mystical.
'I hope those guys are doing fine…' Vale thought as he recalled that Chad, Odessa, Jin, Aurion, and his other Avatar were still in that realm.
For now, however, he felt that he had to visit some of his friends. In any case, most of the immediate problems were already settled.