Terraria, the popular sandbox adventure game, offers an exciting boss progression system that challenges players to defeat formidable enemies to advance in the game.  This comprehensive guide will provide you with an ordered list of bosses and their associated drop items to help you plan your strategy and increase your chances of success in Terraria.

   Boss command list:

   1. King Slime:

      - Drop Items: Royal Gel, Ninja Hood, Ninja Shirt, Ninja Pants, Slime Staff, Slime Hook.

   2. Eye of Cthulhu:

      - Drop Items: Daemonite Ore, Crimten Ore, Suspicious Eye, Shield of Cthulhu.

   3. World Eater/Cthulhu's Brain:

      - Drop Items: Shadow Scale, Tissue Sample, Worm Tooth, Mask (World Eater), Brain Confusion (Cthulhu's Brain).

   4. Queen Bee:

      - Drop Items: Wax, Bee Keeper, Hive Wand, Honey Comb, Bee Hat, Bee Pants.

   5. Skeleton:

      - Drop Items: Clothier Voodoo Doll, Skeleton Trophy, Skeleton Mask, Skeleton Hand, Book of Skulls.

   6. Body Wall:

      - Drop Items: Pwnhammer, Emblem (Warrior, Wizard, Ranger, Summoner), Breaker's Blade, Clockwork Assault Rifle, Laser Rifle, Hungry.

   7. Twins:

      - Drop Items: Mechanical Eye, Optic Staff, Twins Mask, Spasmatism Trophy, Retinazar Trophy.

   8. Destroyer:

      - Drop Items: Mechanical Worm, Excalibur, Helod Bar, Destroyer Trophy, Destroyer Mask, Soul of Might.

   9. Skeleton Head:

      - Drop Items: Mechanical Skull, Skeleton Prime Trophy, Skeleton Prime Mask, Hallow Bar, Soul of Fright.

10. Plantera :

  - Drop Items: Temple Key, Seedler, Plantera Trophy, Plantera Mask, Life Fruit, The Axe.

  11. Golem:

  - Drop Items: Pixaw, Golem Fist, Sun Stone, Eye of the Golem, Golem Trophy.

  12. Duke Fisheren:

  - Drop Items: Truffle Worm, Fisheron Wings, Tsunami, Razorblade Typhoon, Flareon, Duke Fisheron Trophy.

  13. Mad Cultist:

  - Drop Items: Ancient Manipulator, Lunar Hook, Celestial Sigil, Nebula Arcanum, Stardust Fragment, Vortex Beater.

  14. Chandra Dev:

  - Drop Items: Lunar Flare, Meomere, Star Wrath, Terrarian, Moon Lord Trophy, Luminite.

  With this ordered list of Terraria bosses and their respective drop items, you now have a comprehensive guide to help you navigate the game's challenging boss progression system.  As you progress through the game, strategize and collect the necessary equipment to take down each boss.  Best of luck on your Terraria adventure!