I want each biome to have 2 bosses: 1 prehardmode and 1 hardmode. Some biomes also have late game bosses.
1. Generic forest: prehardmode: king slime and eye of cthulhu (Don't forget the goblin invasion) I still want lepus to be brought back/ hardmode: the twins, Late game we have the pumpkin moon. I also want turkor the ungrateful to be brought back.
2. Sky or space: prehardmode: instead of evil biome bosses, this is the boss that drops the meteor. Make it like a large harpy that drops some meteorite on defeat, but also drops the large harpy feather as well. Summoning item is made like the eye but with feathers instead of lenses. Its hp is between the brain and eater of worlds. Its summoning item also requires either tissue samples or shadow scales. This will make it available later on in hardmode. Hardmode: Bring back the arch wyvern and make it a boss. Late game: The martian invasion is space biome related, so is the end game battles from cultist to moon lord.
3. Snow: prehardmode we have deerclops. Please make frost legion prehardmode why 2 invasions from this biome in hardmode and none in prehardmode?
Hardmode: Make the ice golem that boss? Late game we have the frost moon.
4. Desert: Bring back the albino antlion and make it big and spawns from crafting its item from antlion mandibles. Hardmode: Make a giant sand monster of some sort. Late game: Make a sandstone golem or upgrade the sand elemental into a boss, requires the original golem to be defeated and bring the altar to the desert to summon him with a battery like the first golem.
5. Ocean: I am thinking about a large crab shaped boss for prehardmode. For hardmode we have duke fishron but please lower that 50 defense of his why his defense so high for that point in the game and he is tough with high hp. His defense should be like 35 or so given that the only other boss with 50 defense is the top eye of moon lord who is the final boss of the game and a few exceptions with other things having high defense. There is also the pirate invasion.
6. Jungle: The is no not honey related prehardmode boss in this biome. Bring back the dragon snatcher and make it big and make it a boss. Hardmode: plantera which is a boss required for game progression or is it? The jungle temple usually has the golem room at the bottom. Can the player obtain cells early and be able to fight golem possibly even before wall of flesh? Same goes for the solar tablet. I was able to get lizhard monsters to spawn on the main surface of my get fixed boi world. They can drop cells and tablet fragments prehardmode!
7. Honey: prehardmode: Queen Bee. Love the items that can be provided but she is a challenge without beating the king slime, eye or brain (not fully just tissue or scale) for better items to make the fight easier. Hardmode: Simply make a hardmode version of queen bee with things like gives you an infinite flight upgrade to the mount. Also makes mining hive and crispy honey block give you the block with no penalties. Make larva craftable requiring abeemination. The abeemination has the upgrade with chlorophyte in the recipe to make the item to battle this boss.
8. Lihzard: Make lihzard blocks don't count as jungle. This biome is hardmode only except exploits listed above (unless they get patched). The solar eclipse is the invasion of this biome and the boss is golem required for the cultists to spawn.
9. Glowing Mushroom: This biome has no bosses, the truffle worm is used for hardmode boss in the ocean biome. Make a vilicious mushroom boss for prehardmode. Make the truffle sell an item that summons a hardmode super sized glowing mushroom boss.
10. Spider: this biome for sure can get bosses. Make a giant spider boss in prehardmode and can drop items such as the webslinger make the web covered chest and a whole furniture set craftable from a block that is dropped by this boss along with some weapons. Hardmode: The queen spider this boss item is made from black recluse fangs and is very difficult but defeating it provides an item that helps the player defeat duke fishron by ignoring his armor. The queen spider has 50,000 75,000 100,000 hp and just 10 defense, can venom the player and has huge damage 150 300 450.
11. Cavern: This is simply the middle of the map and biomes would have their underground versions from 0 depth to the underworld.
12. Hallow: Worlds now generate with a hallow spot on the opposite side of the world from the shimmer area. There is a lake where fishing can give the player prehardmode hallow crates. A few pearlwood trees are in the area and hallow grass seeds can be obtained from such trees along with their fruit. Not only there is holy water recipe made available prehardmode, but also there is holy powder and there is clean water for the thrown waters. Critters except prismatic lacewing can spawn. Similar to the shimmer area, this biome is an oval of pearlstone blocks with dirt with hallow grass on it inside and a lake. Has a chest at the bottom of the lake with 25 hallowed seeds in it. The gastropod can spawn in prehardmode but rare along with rainbow slime and illuminant slime, this also applies to any hardmode slime can spawn prehardmode at very low 1% chance. The spectral gastropod returns and hardmode exclusive. Pixies spawn prehardmode, but without access to the anvil upgrades the player can only upgrade healing potions and make holy water. Make prehardmode hallow boss: a large prism shaped monster that can drop: ankh items, rainbow cursor, rainbow bricks, prismatic dye, crystal shards, hallow seeds, pearlsand of all 3 types, and pink ice blocks. The hardmode bosses remain the same, but empress can rarely drop terraprisma at night like 5% chance and not from treasure bag need to rebattle the empress of light especially in journey. On master, empress treasure bags drop terraprisma.
13. Corruption: Eater of worlds, and destroyer. Make destroyer exclusive to this biome.
14. Crimson: Brain of cthulhu, and bring back ocram and make him the mechanical brain of cthulhu and exclusive to crimson.
For both of those biomes and worlds that require mechdusa, it will have both an ocram above the skeletron prime head and below it is destroyer. It will also require 4 items to craft the ocram's razor.
15. Dungeon: starting area: make bone and books available before skeletron. This allows crafting bookcases and pianos before skeletron. Remove the dungeon guardian and make 3 rows of dungeon brick blocking the way. Require skeletron to be defeated to be able to mine dungeon bricks and walls. Skeletron will drop the bone key 1% chance. Aside from a few near entrance monsters that spawn and drop bones and books before skeletron, entering via shimmer or any other exploit will result in a dungeon that does not spawn anything. Preventing the player from unlocking any chests and fishing in there will not give any dungeon crates until skeletron is defeated. The furniture and stuff like that can still be looted by the player with exploits. There is a second boss in the dungeon after skeletron but before plantera and before wall of flesh. This is a full body skeletron that is the boss that makes the golden keys not get used when opening gold chests and shadow keys will stack if the player obtains multiple. The entry skeletron can drop gold keys and shadow keys. The full skeletron drops skeletron items and can be rebattled with a summon item crafted using bone and black thread. Hardmode: plantera must be defeated for this boss to appear. This means upgraded dungeon and the boss item is crafted from ectoplasm. The boss is a giant ectoplasm like monster that can drop more ectoplasm among his powerful drops. The boss may also drop things that would be like the ancient manipulator or fragments in small quantities.
16. Underworld. Also needs prehardmode boss: This will be a large fire type shark that can swim in the lava and drops powerful late prehardmode items that can help with the wall of flesh. Meat grinder item now drops only from wall of flesh. Wall of flesh is considered a gradient boss that converts the world into hardmode. Once red devils can spawn, they have a boss that is the demon king. He is powerful but drops strong items (strong enough to handle the entire end game battles [lunar events and moon lord]) He has at least 40 defense and high hp.