Where do you find the echoing fury in Diablo 3?

In Diablo 3, the Echoing Fury is a legendary mace that can be found as a random drop in the game. It is most commonly obtained from defeating elite monsters, opening treasure chests, or completing rifts, particularly in Adventure Mode. The item can drop in any act, but certain areas with higher monster densities may increase your chances. Additionally, you can also find it in Greater Rifts after completing the rift and opening the cache.