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Danny didn't think that falling through a natural portal would result in him stumbling upon a cult. Or that said cult currently was busy with "punishing" a small five year old child.
Really there was only one thing he could do and accidental kidnapping usually happened to him as the kidnapee not the kidnapper.
Well, there was a first time for everything. Taking the small child with him into the infinite realms may have been a panic reaction, and he may have accidentally summoned Frostbite to check over the boy.
Thankfully the kid, Damian he said his name was, was liminal and fine with healing in Danny's castle before Danny would bring him to his father. According to Damian his father didn't like the cult ("It's the league of assasins... not a cult.")
To be honest he was very much out of depth and so very confused when he had to find his way to the crime ridden city of Gotham and then somehow get the attention of the bat vigilante. Batman was tall and very much as scary as a ghost.
Damian looked out from under King Phantom's cloak of stars and galaxies and took in the person who was said to be his father.
"You are shorter than I thought..."
"Hn." Damian turned to look up at the being that had helped him heal and taken care of him for the last two months.
"I have decided. King Phantom shall be my father from now on!" Damian proceeded to hide back behind the being and into the spacious cloak.
"Uhm... I don't think that's how that works bud." King Phantom said, he was interrupted by laughter. Glancing past the being Damian saw Batman and Robin, as well as Nightwing, the last two were laughing while Batman looked slumped.
"I have decided King Phantom is my father, so he is!"
"This is gold!" Nightwing was now struggling to stand up straight.
"I... uh... I'm not sure what to do in this situation?" King Phantom said, Damian leaned forward a bit to glare at him.
"Take me back to your castle father!" Nightwing seemed to struggle with breathing, he was now wheezing.
Danny would like to say for the record that he wasn't prepared for these things! Somehow that strange situation ended with him in the batmobile on the way to the batcave so that Damian would hopefully want to stay with his actual father.