Cultivation of Immortality: the Old Monster Who Seizes the Nascent Soul at the Beginning

Lin Fu traveled through time and directly crossed over to the old monster Yuanying, but this old monster Yuanying had already died due to the failure of the breakthrough. All the mana has completely disappeared. As the ancestor of the Nascent Soul of the Hehuan Sect among the Six Demonic Sects, what should I do if I don't have any mana? I'm waiting online. It's quite urgent.