"When Damian went off with his father, he left Danny behind. Danny returned to make it everyone's problem."
Damian is strength, and Danny is brains. Damian is king, and Danny is executioner. Damian is Mother's favorite, and Danny is grandfather's favorite. Two complementary halves.
While Damian longs for the affection and attention of their mother, grandfather, and father, Danny longs for his brother's. Grandfather may favor Danny, but he doesn't understand him. Mother may love Danny, but she keeps her distance.
Despite Grandfather's favoritism, he refuses to kill. He will torture, kidnap, plunder, and destroy someone's life, but he will not kill. Grandfather's favoritism may be the reason he has survived so far.
But Ra's will not wait for his grandson forever.
Grandfather sends Danny on a special solo mission: to enter an underground arena and be locked in with 29 of the world's greatest warriors and assassins, with one goal on everyone's mind: survive.
At that time, Slade rebelled, and Damian went with B. Damian refused to return and became Robin.
Danny returned.
When Danny was in the ring (the arena), only one thing was on his mind: Damian. He wanted his brother. When he killed with Truss from the ringside, when he slept atop the ring posts with a sharp rock pressed into his hand, when he felt the dried blood under his fingernails and in his hair, the thought of returning and finally embracing his brother was what kept him going.
He returned, and Damian was gone.
He entered his brother's room despite his mother and grandfather calling after him. He waited. Hours passed; he might be training.
He waited. Days passed; he might be on a difficult mission. He stared absently at the clock, feeling net-like hands where those in the ring had tried to touch him.
He waited. Weeks passed. He heard that he was with their father training. His grandfather had sent him on a mission to kill the heir, but that was ridiculous. He wouldn't kill his twin. He pretended to agree. He would go to Damian. Who knew? He might accept living with their father and his sons, especially since Jason would be there.
He waited. Months passed. He stood in front of their father's window.
... He was laughing. Dami, his brother who was always frowning despite Danny's attempts to make him laugh, was laughing among their father's other children, in the living room, among his brothers. They seemed happy, calm, complete.
But that was impossible. He and Dami were twins. They were born together, lived together, and would always be together.
He waited. It was okay. He had waited a long time in that arena, to find the right point of attack, to try to find food before he realized the arena was empty except for... never mind.
He would wait. He would find a moment to show that his brother still thought of him, a chance to show he cared. Days passed, weeks passed, a month passed, and his brother didn't remember him at all.
He had forgotten him.
So Danny, who was kind of losing it in the arena, angry and hurt by his brother's forgetfulness, would start a series of organized crimes: murdering one of the employees at the animal shelter Dami frequented, stealing random items from the Bats' rooms, and carrying out a bombing on their holiday.
While the Bats investigate this new criminal, whom they've dubbed Caly moth (from Calybtra moth) in some areas, Jason finds their method of killing both familiar and strange. Damian notices "gifts" left by the criminal: bloody writings on the wall, the date of the crime, the victim's position, and reminders of secrets between him and his deceased twin.
(The reason is up to you, but B is wearing a bat costume, bats are associated with vampires, and Danny is somehow connected to blood-sucking butterflies.
This triggers something I didn't know existed, or perhaps Danny is using genetically modified Calybtra moths that feed only on blood instead of fruits. -\(•–•)/-)
Wait, I forgot something! Danny actually died in the arena, but a massive amount of electricity (and ectoplasm) from a device worn by someone in the ring who calls themselves Ghost Scientists revived him (then killed him, then revived him, then killed him, then revived him, then...). When he returned to LoA severely injured and barely alive, Ra's put him in the pit to recover.
When traces of him being halfa appeared, Ra's used that and tried to develop it in Danny, so yes, Danny is trained to use his abilities here.
Danny is doing something behind the scenes, testing the bats to see if they will accept him or not. Everyone fails (for reason or another) except Jason, but his sadness and anger lead him to carry out his plan to kill or destroy the bats without the final test.
So, a dialogue ensues like:
Damian:"How do you know they won't accept you? I may be a bad brother, but why are you judging our father and brothers without knowing them!"
Danny:"You think I didn't? *Starts listing where everyone failed* I know they won't accept me."
Jason:"...What about me?"
Danny:"What?"
Jason:"B, Brat, and the others failed, but what about me? Where did I fail?"
Danny:"That doesn't matter. They failed, and you will too. It's not like it's strange to you." (Forgive him, Danny wants to hurt them any way he can.)
However, the bats won't know who Caly moth is at first, but Jason and Damian will search separately and find the truth first.
Damian, overwhelmed with regret, will try to bring his twin brother back with him, whom he thought was dead. He will try to explain his position: "I tried, I swear I tried to find you, and when I didn't, I thought the worst."... You should've tried harder." (angst my beloved)
What do you think? :) What do you think will happen in the end?
This is great au but fudge dose it hurt 😔
Hoping for happy ending but great fic idea
If anyone writes a fic please tag me I want to read 
