The Ardougne Cape 4 is a cape obtained by combining the stone tablet, slate tablet, shale tablet, and granite tablet. The tablets are dropped by Goblins, Monkey skeletons, King Black Dragon, and Nex/Zulrah respectively.
The Ardougne Cape is incredibly difficult to obtain, but with that comes a great reward. The Ardougne Cape has the same stats as a Max Cape but with an added bonus, unlimited prayer.