The Mt. Firmament in Wuthering Waves is home to some of the unique Tacet Discord enemies, including the Clang Bangs. They boast a dedicated Echo Challenge, which requires players to transform into them to complete a series of missing ice block puzzles and break frozen walls to access some of the hidden treasure chests. The solutions aren't very difficult, since it takes about a minute to understand the required pattern. With 13 of these challenges scattered throughout the mountainous area of Huanglong, the Proxies have quite an exploration ahead of them in Wuthering Waves.