Name: "Jin Deng Yin" or "Su Migration Tribulation". Her soul is bound to a special "glazed ember lamp" (perhaps a fragment of an ancient magic weapon integrated into the soul, or some kind of bloodline curse/blessing).
Trigger mechanism: passive trigger. The ability will only be activated when the male protagonist dies completely (soul-stricken or physically dead and irretrievable) due to her direct or indirect reasons (protecting her, being involved in a whirlpool due to one of her decisions, or a disaster she failed to prevent in time).
Lookback point: The time point of each lookback is uncertain, it may be days, months, or even years before the tragedy. The more critical the retracement point (closer to the death point), the deeper the "etch marks" will be after the retracement.
Price - "Etch":
Embodiment: Every time you go back, there will be an irreparable crack on the Glazed Ember Lamp (corresponding to the ninth life, there are already eight cracks). At the same time, the heroine's body/soul will also leave "etch marks": it may be a mark similar to a glass crack on the skin somewhere (subtle in the beginning, hideous in the later stage); or she may gradually lose one of her senses (such as vision, hearing, taste, and she may have become blind after the seventh life); or her vitality will disappear at an accelerated rate (white hair, prone to illness, lack of physical strength); or she may suffer from the sharp pain of soul tearing during retrospection, and the pain will accumulate.
Memory price (optional): Each time she goes back, she may vaguely forget some non-critical details of the previous reincarnation, especially those that were too sweet or too painful, leaving only the deep obsession (to save him) and the lessons of failure. But the ninth life is the key turning point!
Limitations: She cannot change major historical events that have nothing to do with the death of the male protagonist (such as dynasty changes, natural disasters), nor can she change the core characters and choices of others (can only influence them through her own actions). She can only act around the core of "saving the male protagonist".
Intention: Time reincarnates, the person who loves you will never change