The Demoness of Eternal Youth is a stage where the decisive factor is the choice made during the ritual: it determines exactly what the bearer becomes.
The ritual offers to find one's own mirror "self" and deal with it in one of three ways: enslave it solely by one's own strength, genuinely make it fall in love with oneself, or reconcile with it.
If reconciliation is chosen, the consciousnesses of the mirror and real halves merge, and the bearer exists simultaneously on both this and the other side of the mirror. This also frees her from the main affliction of the third Sequence: answering the prayers of the faithful, she loses neither combat ability nor ordinary life, because her consciousness is unified.
The other abilities grow in all directions:
Petrification is no longer limited to hair, though turning a target to stone at a distance is still impossible;
The charm of the times of Pleasure is amplified many times over;
the dark magic of mirrors and curses grows considerably stronger, and mirror magic expands;
the Plague, when the potion is fully digested, reaches up to ten kilometers;
the threads obey somewhat better than before.
The mythic form develops: the gorgon becomes fuller, the hair entirely turns into snakes, and each has a clear black-and-white eye on its head.
The method of action, meanwhile, requires not strength but endurance: to maintain a non-aging state of mind in defiance of erosion by time — for hundreds and thousands of years.
