I think in 1.4.3 in my opinion for Hybrid melee and summon class
1. Eye of Cthulhu (Sometimes I summoning below 200 health)
2. King Slime/Slime Rain (rarely, for fun)
3. Blood Moon (oh boi for blood moon fishing)
4. Goblin Invasion (progression)
5. Deerclops (progression)
6. Eater of Worlds/Brain of Cthulhu (progression, for the Ballista Rod)
7. Old One's Army (Tier 1, progression)
8. Queen Bee (for Bee Keeper)
9. Skeletron (progression)
10. Wall of Flesh (progression)
11. Skeletron Prime (progression, for Ballista Cane)
12. Solar Eclipse (progression)
13. Old One's Army (Tier 2, for Ghastly Glaive)
14. Pirate Invasion (progression)
15. Goblin Invasion (Hardmode, progression and for Shadowflame Knife)
16. The Twins (progression)
17. The Destroyer (progression)
18. Queen Slime (progression)
19. Solar Eclipse (After killing all mechanical bosses, progression)
20. Duke Fishron (progression but recommended to beat it after beating all Mechanical Bosses, for Flairon and Fishron Wings to defeat Plantera but I recommended for the armor is Hallowed Armor, The weapons afe Shadowflame Knife because its effective for Duke Fishron with Flask of Curse Flames, Ballista Cane, and Sanguine Staff, and and better accesories)
21. Plantera (progression)
22. Solar Eclipse (After defeating Plantera, for Terra Blade)
23. Pumpkin Moon (progression)
24. Golem (for the Ballista Staff)
25. Old One's Army (Tier 3, progression and the Flying Dragon)
26. Martian Madness (progression, for the Influx Waver)
27. Frost Moon (progression)
28. Empress of Light (progression, for the Kaleidoscope Whip)
29. Lunatic Cultist (progression)
30. Celestial Pillars (if any near pillars, or what class depening you are)
31. Moon Lord (progression, but recommended is Hallowed Armor other than Beetle Armor because Hallowed Armor is much better, sometimes I beat Moon Lord on 435/520 (using Lifeforce Potion) Health)