On here http://www.tip.it/runescape/?page=ardougne_achievement.htm

 

At the bottom where it says :

 

All Hard Tasks complete

 

After completing all the easy, medium and hard tasks, speak to Aleck at the Hunter shop in Yanille. He will give you an experience lamp worth 28,000 xp (this lamp can only be applied to a skill that is level 60 or higher) and the final upgraded Ardougne cloak 3. (Don't leave yet, you will want to continue speaking to him to unlock the Elite tasks!) Wearing this cloak gives all the benefits of the previous ones plus:

 

* Reduces chance of being caught pickpocketing and stealing anywhere in Runescape

* Magical traps on chests will teleport you to Ardougne's north bank instead of a random location.

* Chance of getting even more noted drops at Tower of Life

 

 

 

It says final cape, yet there is a 4th one for elite tasks.

Thank you for pointing that out :)

 

I've adjusted the text such that the cape is now 100% less final. Changes should be live shortly...