Akuma are weapons used to kill people that are powered by souls. The more people they kill, the stronger they get. [And the more the soul is destroyed. Alma steps back a little, moving away from Salty and wiping his hand on his pants. It's not like he minds saying it. Alma hates liars and why should he lie? Dean could tell Castiel, but Castiel already knows.]
He didn't replace my soul, I still have it here. But I know I blew it up and it worked. Everyone told me how I died. When an akuma self destructs, they destroy their soul completely like it was never there. But Acumen brought me here and removed the dark matter that turned me into an akuma, so I'm just...here. But I'm dead there. Gone like I never existed.