After a long lovemaking session with Helena and Oya, Lucien had to stop when the girls' minds and bodies could no longer handle so much demonic energy.
The benefits for Helena were far more than they could have expected, and not only did she become something different from anything else, but she also got much stronger than she ever was.
No longer feeling weak and sick, she is back to her original power level, the third layer of the Immortal Realm. However, her real strength is far greater than that, as are all of Lucien's wives.
Yet, she has a long way to changing her faster age progression. As Sloth explained, only if she keeps getting Lucien's energies, especially his life mana, will she really get rid of that curse.
Now, she sleeps side by side with Oya in Lucien's big bed while her body converts his energies into her own power, making her even stronger.