Hardshell Mirelurk

Hexproof
"I been huntin' 'Lurks 'round these parts for twenty years, so let me tell you something son:
Ain't nothin' gettin' through a 'Lurk's shell,
no sir. Guns, lasers, radiation, sledgehammers-
you name it, it's been tried. And if you don't believe me son, you can always ask the bones!"
— Far Harbor Fisherman