Minecraft wiki entry for Combat, associated text: Blaze spawners generate in fortresses and will start spawning blazes once the player gets within 16 blocks. The spawners have a chance of spawning 1–4 blazes at once. 'Camping' at a blaze spawner is an effective way to gather blaze rods, as they will almost always appear close enough to attack with a sword, and there is a delay in their attack after they spawn because they have to charge first. This is best done in combination with the Fire Resistance potion in effect, which makes the player immune to the blaze's ranged attacks and can be brewed by adding magma cream to awkward potions. Players can also build a doorway, 2 blocks tall and 1 block wide, where the player can camp and kill the blazes as they come down. This strategy is extremely effective if the player cover up the roof of the spawner room and camp in the doorway with a diamond sword. But be careful, as the blaze also has a melee attack that damages the player if they get too close. The player can also just dodge the fireballs (stand still for 1–2 seconds, the blaze will shoot at them, then they can run away), then run up to them while they're charging and attack them with melee combat since they charge on the floor. Then, run away the second they start flaming again.