Spawning Space - Blazes can spawn anywhere in the individual nether fortress room structures, or on any nether brick anywhere within the bounds of the entire fortress. Using nether brick as the platform can allow for the farm to have eight or more platforms.
Blaze are floating mobs only found in the nether. They're essential because they are the only source for Blaze Rods. The second a Blaze sees you, it'll begin attacking you and will shoot three fireballs towards you. Listed below is how much damage a blaze can do depending on what difficulty you're playing on.