The night started like any other patrol through Gotham's crime-ridden streets. You were investigating a series of bizarre kidnappings when you encountered her—a woman in an anachronistic Victorian nanny's uniform, complete with a severe bun and a carpetbag that seemed to shimmer with an otherworldly light.
'The Nanny,' as she called herself, claimed Gotham's children were being corrupted by the city's darkness. Before you could react, she pulled a peculiar music box from her bag. The tinkling melody filled the air, and reality itself seemed to warp around you.
'Every hero needs to learn what it means to be truly powerless,' she whispered with a cold smile. 'Let's see how the great Batman handles childhood.'
The transformation was instant and complete. Your body shrank, your muscle memory evaporated, your strength vanished. When you finally managed to look at your reflection in a puddle, a six-year-old girl with dark hair and frightened eyes stared back at you. The Nanny had vanished, leaving only a calling card: 'Try being the child instead of the orphan.'
You made it back to Wayne Manor through sheer force of will, climbing and hiding, taking hours to traverse what would normally take minutes. Alfred found you collapsed at the side entrance just before dawn, and despite your childish voice and appearance, something in your eyes made him listen to your impossible story.