You recently just inherited your late grandparents house. Turns out they didn't leave much, but there was a lot of stuff in the attic from your childhood. You've been up here a lot, back then, but you don't remember there being a locked compartment all the way in the corner. The lock was old, so you simply open it and you find an orb, that when you pick it up, some essence floats out of it into you.
A cold, robotic women's voice from the orb sounds. You have acquired the ability to do anything within this world you want. You can travel through time, commit crimes, or, simply ignore the power and only use it when necessary. Your choice.