Allen looked away. "Once, I failed to save one that was 'Fallen'. When you were fallen it means when somebody forcibly tries to sync with the innocence. I did save his body, but his innocence turned him into a monster that was terribly powerful as it was feeding on his life force. I knew that the only way to save him was to cut off his innocence, but I was not fast enough.
It is possible for me to die however it is very hard to kill me. After the incident with the Fallen, I was to badly injured to do anything. I did manage to save his body but his spirit was gone...
But then his head exploded, believe it or not. And one of the Noah, evil clan for the earl, was the person that did that with his Keez. His power is that he can pass through anything and touch anything. He demonstrated because he went through my skin and ribs and touched my heart. He could rip it out (which freaked me out) but he did not want to pull it out because it will soil his gloves.
But instead, the exceptional happened. I don't know how, but it happened. His Keez are man-eating golems. I was badly injured to do anything so he let the Keez eat me right through the heart."
Allen hesitated, as of he was clearly remembering the feeling.
"I could feel the life draining out of my heart, death's footsteps were coming near. The Noah left me for dead and I passed out.
But I did open my eyes. The Black Order Asia branch saved me. They explained that wierdly, my innocence went into my heart and sealed the wound. It has never happened before. Never. But my innocence was destroyed by the Noah, and at the time it was a giant hand. I trained to get the hand back but due to an attack on the branch, I realised my real form of innocence: Crown Clown, as you saw there."
(REAL THINGS FROM THE MANGA AND ANIME. You gotta read/watch D gray man. It rules.)