Secrets and Pasts can hurt
Damian and Raven both have dark and unwanted pasts. They live in a world where pasts could break them, but these two don't know what the other suffers from.
Trigon, the conqueror of so many planets.
Ra's al Ghul, an assassin, a madman.
Talia al Ghul, through her madness tried to overthrow Bruce Wayne and bring all the most powerful people to their knees.
Raven and Robin hide what they are ashamed of, but it becomes to stressful for Damian and he run out of the house one night, wanting to return to the League of Assassins. Batman and Raven go out on a search for Robin along with the other Teen Titans, but what else was Damian hiding