Minecraft/Nether Fortresses

Nether Fortresses
Nether fortresses are structures made from nether brick that are filled with loot and dangerous mobs. They have nether wart (needed for brewing), wither skeletons (melee mobs that inflict a worse form of poison, but can't enter two-block spaces), and blazes (from spawners).

Blaze Hunt
Blazes are flying creatures made of fire that shoot fireballs at you. They spawn from spawners (cages at the top of staircases with mini blazes inside). They are weak to snowballs. They drop blaze rods.

Blaze Rods and Powder
Blaze rods are dropped by blazes and used to make brewing stands. Putting them in a crafting table by themselves makes 2 blaze powder per rod, which is used for brewing stand fuel and eyes of ender.