D.Gray-man - Season 2 Episode 20 The Name Chronicled

Allen engages the Level 3 Akuma in battle. Allen speaks to the soul trapped within the Akuma, and learns that this soul was the one that had previously been calling out to him. The soul asks Allen to save him, and Allen consents. However, because his body's composition is unstable (due to the Akuma's prior attack), Allen literally begins to crack during the fight. When Allen crumbles completely, the Akuma turns on Bak and Fou, partially decomposing their bodies too. Enraged, Allen finally manages to reactivate his Innocence and, and he destroys the Akuma. His new Innocence gives him a long black arm with razor sharp talons for fingers. He also acquires a white cowl that shoots web-like projectiles and is fitted with a mask. Before the Akuma dies, he tells Allen of the gathering of the Noah, the Level 3 Akumas, and the Exorcists in Edo.