Damien Wayne is the offspring of Bruce Wayne and Talia Al Ghul. He's pretty much a wild card and he was also responsible for the death of Nightwing in the Injustice comic. So you can understand why Batman's pretty mad at him even though he's his own son.
With Injustice 2, you'll get a chance to play as Damien Wayne in his Robin costume. Today, Warner Bros has released some footage of Damien in action. He's got a sword, which is what Ras Al Ghul, his grandfather, uses but he's also got all the bat toys that Batman is known for.
May 16th will be the day you can get your hands on the next DC fighter and it'll be out for the Xbox One and the PlayStation 4.