User blog comment:Dragon´s Blade/World Coexistence Alliance/@comment-24376783-20141022000929/@comment-24376783-20141022034542

Lyssa's Darkness entered Lyssa's mind and modified her memories, removing Tina and make Shiva her sister.

Meanwhile:

Shiva's Darkness went into Shiva's head and modified her memories as well.

Amy's Darkness also modified Amy's memories.