Disgaea 3: Absence of Justice

To get this trophy, you need to kill the “Cowboy Pirates” in the world of the item - these are pirates who travel on a huge wooden boat with a skull. Like all pirates, they appear in the world of objects after level 20 and appear during the first 3 turns; if they have not arrived in three turns, you can safely move to the next level and wait for them there. "Cowboy Pirates" usually appears at levels 61 to 69.