She-Ra: Princess of Power1985

She-Ra:
Norwyn, exactly what happened between you and Shadow Weaver?

Norwyn:
It all happened shortly after the Horde first arrived on Etheria. Though we were outgunned, there was hope, as long as the Council of Kings were safe. Only a handful of us knew the secret location of their base. Among them my students, Castaspella and Shadow Weaver. What we did not know was that Shadow Weaver had made a deal with the Horde. They would provide her with a Power Gem that would make her powerful beyond imagining. In exchange, she would betray the Council of Kings. I discovered what was happening, too late. I destroyed the Power Gem, but not before she had taken a third of it's power. It changed her forever and for that reason she has hunted me ever since.