Climbing 'O.N.' on the impressive Lackenkopfwand in Austria's Gesäuse National Park is a significant undertaking, graded a challenging 8-/8 (UIAA). This route, etched into the steep limestone, demands precision, endurance, and a cool head. Climbers can expect sustained technical sections, often on small holds, through exposed terrain. While not an extreme elite line, it represents a true test for advanced climbers, offering a rewarding experience with breathtaking views. Successfully topping out on 'O.N.' is a memorable achievement. The descent from the Lackenkopfwand typically involves a combination of rappelling or a scenic, albeit sometimes complex, walk-off.