The Slaver Heavy Guard is exclusively located in Slaver outposts, towns, and otherwise locations. They stand between players and the inside of said locations, though they are not hostile unless they or the town is provoked. Despite their name, the only thing better about the Slaver Guard as opposed to a Slaver is heavier equipment, and a slight increase to the likelihood of it being standard grade. They exclusively wield Spiked Clubs, which makes them an immense threat to characters neglecting blunt damage protection and low bleed modifiers. Despite their importance, they wield nothing greater than Ancient grade weaponry and shoddy (occassionally standard) equipment.
Players attacking such locations should expect these to be the most significant challenge, though the sheer number of slavers alone might suffice as enough trouble.