Minecraft wiki entry for Defeating_a_Nether_fortress, associated text: Totems of undying can give you fire resistance. However, totems of undying are rare and can only be found by killing an evoker, a rare and powerful mob. You will also have to die for the totem to activate and give you fire resistance. You will likely not have fire resistance on your first time through, but once you get two blaze rods (see 'Brewing' below)(coming up) make fire resistance potions as quickly as possible.