After Nightmare Moon was brought back again, she was pregnant again. And then she gave birth to "Princess Black Hole".
Yuna as her target
Princess Black Hole main target is Yuna. Princess Black Hole is will try to do anything to get Yuna, including trying eat the young filly's heart. [but she knows her mother will punish her if she does, but sometimes she forgets]. But she might often run the tip of her dagger on Yuna's mane and tail. But she will still hunt her to the end.
Fights with her sister
- Princess Black Hole made her debut in Thomas' Amazing Adventure: The Search for Pufferrod the original Train-Prime.