Wilderness Tag

Wilderness Tag is a so far unreleased update announced in the Behind the Scenes of April 2006. JaGex released this official description of it:

Wilderness Tag features a series of pillars dotted around the entire of the wilderness, with players being invited to tag them, similar to the way the Agility Arena works but without the timers. Players who successfully tag all the pillars (featuring various levels of difficulty) are rewarded with a generous helping of combat XP in the discipline they choose. Be careful, though, it is the Wilderness after all.