From this angle Storen may look frightening, but climbing the ridge to the top is UIAA grade II only. First absail (40 m) from Vesle Skagastølstind (2340m) down to the Col of Mohn, or climb down (UIAA IV). You'll probably find the ridge up to the summit of Storen surprisingly easy. Even in light rainshower we didn't feel any need of rope!