Death. In Batman Incorporated #8, Damian is killed by his clone, The Heretic, during a Leviathan invasion of Wayne Tower. Shortly before his death Damian has a heart to heart talk with Nightwing.

How was Damian Wayne resurrected?

While many fans might have thought Damian's grandfather, supervillain Ra's al Ghul, would toss him in a Lazarus pit and raise him back to life that way, instead the boy's body was taken by Darkseid minion Glorious Godrey to their hellish world of Apokolips.

How old is Damian Wayne now?

As of Robin (Volume 3) #1, Damian is 14 years old.