Something like that. mask 10/10.. indestructible magical entity.. vs superman.. who's only real weakness (if you want to call it that) is that magic acts on him like it does anyone else.
"Look Superman, I've got a gun"
"Do your worst!"
BLAM!! BLAMM!!!
Blood drips from the side of superman's head and lines the pavement
"Eh, that wasn't even my worst!"
yeah but did you read lobo/mask he and lobo killed entire planets just for fun and gods too, then they both got into a fight and the mask was reduced to NOTHING and still healed within seconds fully, he reduced lobo to nothing but a head winning im supposing then lobo got the mask too and killed whole galaxies.