A Statue of Guthix can be found in the caves of the Mage Arena, along with a Statue of Zamorak and Saradomin. Players who complete the Mage Arena minigame by defeating Kolodion in all of his forms can pray to one of these statues to receive a god cape in the theme of the god chosen. Praying to Guthix rewards the Guthix cape. Players can receive as many capes as they want by continually praying to the statues.
The update history project is a work-in-progress – not all updates to this topic may be covered below. See here for how to help out!