All Goblins prefer using dirty tricks to straight fighting, but some are better at it than others. Where regular Goblins will gang up on crippled foes or try sneak attacks, the individuals known as Nasty Skulkers will leap out of the mob and quickly stab a couple of enemies before slinking back.
They are so fast that enemies might not even notice them, let alone strike back. Armour offers scant protection, for those Goblins have long learned to find inevitable chinks with their razor-sharp blades. No wonder that even their Goblin brethren consider them to be a "bad piece o' work".