Blaze

A blaze is a fiery hostile mob found in Nether fortresses and is the only source of blaze rods. A blaze attacks by floating upward and shooting fireballs at its target in volleys of three at a time. It can also attack its target in melee range with its spinning rods.

Blazes may spawn naturally in Nether fortresses in groups of 2 or 3‌[JE only] and from 1 to 3‌[BE only] at a light level of 11 or less.

Blazes may also spawn from monster spawners in Nether fortresses. Two spawners generate in every Nether fortress and are located on small platforms surrounded by Nether brick fences with a three-block staircase leading up to it.