Hollow Knight - Broken Vessel mask. Started with model from https://www.myminifactory.com/object/3d-print-hollow-knight and modified/scaled/sculpted to work as a mask. Horns glue on to face (may need to remove divots). Blob can be screwed/riveted on through the top of the mask. Hot glued elastic band to holes on side to hold it on head. Sculpted using blender, meshmixer, and assembled with inventor. Mesh can be softened with a hair dryer and molded/glued into the eyeholes.
The author hasn't provided the model origin yet.