I have a boss idea for something in Hardmode, and I just wanted to share it. Don’t know if you already have a ton of plans for Hardmode, or this just conflicts with lore, or this just sounds like a ton of plagiarized trash (to be honest, it is indeed very.... odd and takes other bosses and just merges them.), but here is my idea.
The Synthesia, the ever growing plant Hive mind.
So, the entire idea is that, after Golem, a Plantera bulb grew a bit too much and burst out hundreds of seeds. The seeds mostly just landed in lava pools and honey pools and other places unfit for plant growth. One of the seeds, however, landed on a giant wasp thing. The seed burst open in vines that pierced into the brain of the hornet, and produced more seeds inside the hornet, and the hornet started to buzz around and shoot other creatures with seeds, and thus turned the jungle into a hive mind. The modified plant became known as Synthesia
So, the player then goes around, slaying these creatures, crafting, IDK, a magic book or some kind of ammo with the seeds that the enemies affected by the plant might drop. Anyway, the thing the enemies drop could be used in a boss summon crafting recipe, to create the Master Fertilizer. This Master Fertilizer, when used, summons a Giant Clump of Synthesia, all wrapped around a clump of bees and turtles. The fight starts out as, essentially, just a little harder plantera, with the Clump using vine tentacles to navigate, and shooting tons of pellets and stuff that deal moderate damage.
The fight continues like this until it reaches around half of how ever much health you give it. Once this happens, two smaller clumps appear and act like the Twins from the mech bosses, one shooting lengths of vines at the player, the other spraying seeds everywhere .They do not have an insane amount of hp, but do take a good amount of hits to kill. Maybe you could add a thing where you must defeat the two smaller clumps before doing more damage to the big clump, IDK. While this happens, the large clump acting as a Plantera knock-of goes into a second phase, where a circle of spikes shoot out every couple seconds, whilst the clump goes into phase two of Plantera, shooting just poison seeds, seeds that explode, and seeds that home in on the player.
Once the main clump reaches a third of its health, random enemies infected by the Synthesia start spawning a lot , just there and attacking like regular. Then, once the main clump reaches a quarter of its health, seeds fall from above, and a worm-like clump spawns, the worm having, like, a good chunk of health, but a low amount of damage, and the main clump gaining a little more damage reduction and charging the player while shooting them with bouncing seeds, seeds that explode, homing seeds, and seeds that spawn in a random Synthesia infected enemy.
Once the main clump is killed, a large amount of regular hornets burst away, loot from the boss drops, some seeds drop, and Synthesia enemies start to spawn in less.
Sorry for that being so lengthy. You can do whatever you want with this, not use it, change it, change the main clump into an infected queen bee, I don’t care. Heck, you could make a Hardmode queen bee with this idea of an infectious plant . So yea, that’s a boss idea I had. Do whatever. Modify the other stuff that spawns in to something else if you want, I don’t care, as long as you keep up the cool work.
P.S. Might be smart to just... move this to Post-Moonlord, if you do it. Oh, and, sorry if this just is way too hard to code to be possible for you to do. Also, just CONSIDER this. I don’t care if you do not use it. Also, the reason the main thing acts like Plantera was because the plant originated from a Plantera Bulb.