Climb the undercut corner to reach cracks right of ariel's arete climb these to their top and break out left to gain a giant pocket and traverse to the finish of ariel's arete.
Eds note- Gary Katter Scottish Rock Vol 1 describes this as a 30m E5 6a. the latest SMC guide 2014 is 40m and E3 6a. Happy to split the difference having not climbed it myself.
Ultimate Scottish Rock, Ultimate E4 ticklist