One Piece chapter 1189 revives Usopp's Observation Haki and unveils Imu's deadly Fragarach sword

Chapter 1189 of Eiichiro Oda's One Piece manga marks the first confirmed use of Observation Haki by Usopp in twelve years. After Imu's attack leaves Luffy severely wounded, Usopp senses the danger and briefly activates the long‑absent Haki, hinting that he has not fully mastered the power.

The same chapter also introduces Fragarach, described as the Sea God's sword, wielded by Imu against Luffy. Fragarach is one of the nineteen legendary weapons created by the founders of the World Government and can turn matter to dust. Imu's strike nearly destroys Luffy, but the intervention of Scopper Gaban saves him. Fans have highlighted both the return of Usopp's Haki and the revelation of this powerful weapon as major developments for the series.