To avoid ice cliffs at the top of the Credner Glacier trend left or take the Oehler Ridge exit for the others. This can be reached by icy couloirs and bulges. Once gained it is easy-angled. Leave the glacier by traversing right, level with the top of the Ravenstein. A tough walk up steep scree with some easy rock scrambling.
Snow cover makes the scree easier but an ice axe is then required.
Afternoon mists can make route finding on the descent difficult. This has been compared to the North Wall of the Eiger. A bivouac below the icicle allows it to be climbed before the afternoon thaw. Good bivouac site on top of the Window Buttress. The lower rock buttress presents complex route finding, following ledges and snow and ice couloirs leading to the upper slopes.