The new masks should either hide away character monstrous trait or give them one.

[Frosty_Mentos]

The normal masks seem harmless should conceal monster character identities, fooling creatures that they are just simple folk or so, while mask like shattered mask should show monstrous trait and anger or scare creatures for what it may resemble.

The idea being that Hamlet Webber got the glasses to survive in the pig infested environment with a simple pig mask. If he can do that why can't he, Wurt and Wortox be able to fool creatures of the Constant with something like a Doll's Mask? More intelligent creatures like Pig King could see through the lie still cause of Wurt's traits. Overall masks could bring simple neat utility besides being just there for the looks and theatre.