Minecraft wiki entry for Gathering_resources_on_peaceful_difficulty, associated text: Blaze rods can only be obtained by killing blazes, which is impossible on Peaceful difficulty. Unfortunately, blaze rods are essential to going to the End, because there is only a 1 in a trillion chance that an end portal will generate with all eyes of ender in it, and eyes of ender require blaze powder. However, brewing stands, which usually need a blaze rod to craft, can be found in igloo basements and village temples, but no potions can be brewed because they require blaze powder as fuel. Even though the player may not be able to go to the End on Peaceful difficulty, there are plenty of other things available to do in the Minecraft world.