Diablo 4 Broken Bulwark
The Broken Bulwark Dungeon is located in Scosglen, and after you complete will unlock the Ghostwalker Aspect. You will encounter Ghosts, Goatmen Monsters and should be able to clear Broken Bulwark at a speed.
Broken Bulwark Location
You can find the location of Broken Bulwark within the Westering Lowlands in Scosglen. After completing the Broken Bulwark, you will unlock the Ghostwalker Aspect.