They are often present near the marketplace in East Ardougne, or the south east bank. One of them is also near the entrance of the Ardougne Zoo. Heroes attack players when they steal from the Gem stall. They also attack when the player steals from a stall and tries to trade the stall owner. One of them is always near a bakery stall, so the player can easily steal food to heal from failed pickpocketing attempts. A bank is just south of the marketplace and like most banks, would automatically heal the player up to maximum life points.
Unlike most thievable NPCs, players can be stunned frequently when pickpocketing heroes even at level 99 Thieving. A test at level 80 Thieving without any boosts only had 61 successful pickpockets in 200 attempts, making the success rate only about 30%. A successful pickpocket attempt usually gains 200 or 300 coins.
They are weaker and have less health than the Knights of Ardougne they guard alongside, despite wearing rune equipment, guarding a higher level stall, and requiring a higher Thieving level to pickpocket.