Minecraft wiki entry for Gathering_resources_on_peaceful_difficulty, associated text: Piglins naturally spawn in the Nether, specifically in crimson forest and nether wastes in all difficulties. They become passive in peaceful mode and won't attack the player, though they'll still hunt hoglins occasionally (thus, they may accidentally hit the player if they use a crossbow to hunt hoglins). While piglins drop nothing upon death, they can be bartered with, which can be used to obtain several normally unobtainable things in peaceful or in the nether such as fire resistance potions, and water bottles.