Minecraft wiki entry for Things_not_to_do, associated text: The most reliable way to obtain fire resistance is by brewing the correct potion. To brew any potion at all, the player must have access to blaze rods, which can be turned into blaze powder to fuel a brewing stand, so they must have fought blazes inside a Nether fortress first. From there, the main ingredients required for fire resistance are Nether wart, which can be found growing in Nether fortresses and housing unit bastions, and magma cream, which can be obtained from bastion treasure chests, killing larger magma cubes, or crafting with slimeballs and blaze powder (see below):