30m. Right of Black Slab. A fine line but lonely lead. The holds on the arete are positive and they keep coming but don't fall off or you'll leave a big crater. Start at an overhang directly below the arete on the left side of the buttress. A tricky start gains good holds above the roof. Continue past a perched block to the base of the arete. Climb the arete, treating a loose block at half height with care, to a welcome ledge. Go up an easier slab, and surmount the final bulge to a two-bolt belay. Abseil off.