Provided this line is done by avoiding the left wall/ gully and just ascends the slab and left arete, it goes in the 5.10 range. As a TR, it is fun for the grade, but once you are clipping the bolts, it gets a bit headier. To stick with the "Oz" theme, it's called Ruby Slippers. I did the first ascent of this line with bolts, though it may have been soloed at some point?