This is Nightmare’s Helmet from the game Soul Calibur of Dreamcast port.
From my googling skills there seems to be 3 type of helm from Soul Calibur series. There’s misery, agony and torment.
Sadly I don’t know which one is this from other than it’s from Soul Calibur 1.
Nightmare’s Helmet is unfolded by AdamMasterArt from deviantart.
It’s a player 1 helmet.
The scale is 1:1 which mean it’s wearable for cosplay or Halloween. The paper craft templates requires 18 sheets of papers.