Sounds like a role that is both too powerful and not being able to win.
How do you counter it?
#Quirk role
obsidian moth
That would be less a problem than the "invincible" part.
Winning by being the last one standing doesn't really work, especially if that's already the win condition for non-crewmate killer roles, basically, and winning through sabotage is incredibly rare
knotty saddle
That's a big nope on the role.