darkness_devil
The Darkness Devil is a devil that embodies the primal fear of the dark. It serves as the secondary antagonist of the International Assassins arc.
The only contract with it seen so far is with ]], in exchange for bringing the heart of to Hell, [[Santa_Claus_(Chainsaw_Man)| gained a small portion of the devils flesh which allowed the assassin to manipulate their body in darkness and amplifies their total power.