I was about to fix the icon but suddenly it looks fine?

@Pixus, I'm totally fine with others making add-ons that add cross-mod content

As for the mod icon, good question. No idea why it's missing all of a sudden, I'll get that fixed as soon as I get the chance.

I do agree with BlockCrusader there, but is the thought of someone else doing cross-mod compat for that off the list?

Also, what happened to the mod icon here?

Rip D:

@MathandMelons, personally I don't feel it's worth the effort. Making more re-colors of the boss is a relatively simple - albeit tedious - task, but I'd also have to make two entirely new gear sets, which would - ignoring the boss itself - essentially equate to doubling the amount of content (And just for one cross-mod at that).

can you make this compatible with terraria origins? Like a defiled/riven core boss

I love the Crimson Cringe

@TheArcadian58, the 'crimson is cringe' thing in the description is really just part of something of a running joke in the mod since it's predominantly focused on the Corruption since the boss was designed around it thematically (The Crimson variant was an afterthought so both types of worlds can access the content, plus to add Crimson counterparts to the new loot).
It's not intended to be taken that seriously, and is meant to be treated as an instance of the Corruption vs. Crimson memes. Regardless, you make a good point IMO.
Personally I tend to play Corruption more because I like its aesthetic and music better, also the Musket and Dart Rifle are very good ranged weapons in the earlygame and early hardmode, respectively.

Here's my opinion on the Corruption v Crimson thing:
Corruption is better for beginners as it it easier but the loot is worse
Crimson is better for experienced players as it is harder but the loot is better
Neither of them are bad, I tend to just click the random button upon creating a world and let fate decide.
If you want to say that my opinion is wrong then that is your opinion and I respect it.

@Erolsaurus, this is true.

...but I'm too lazy to come back to this mod and make cross-mod variants...

Contagion fans:

Tfym Crimson is cringe bro dont ever speak again or else Im forcing you to fight a thousand Perforator Hives on Infernum mode with no armor no accessories and with only the copper shortsword 💀

@PLMMJ, I dunno when/if I'll come back to this mod, but if I do that's should be an easy addition.

I am curious though, so you're finding the boss too easy on one difficulty and too hard on higher difficulties, or just the former?
I will say that yes, the boss is pretty easy to cheese with circular movement patterns. It's something of an inevitable flaw given the boss's movement style and the fact that its projectile attacks lack prediction.
Also, are you fighting the boss on the surface? The extra space makes the fight much more manageable (Probably too much so) in my experience.
Another thing to note is that the boss will definitely feel easy compared to most modded bosses, as the base/classic AI for this boss is meant to be more tame, like classic mode vanilla.

I've considered a rework for the future but it's very low priority compared to other plans I have since this is just a small thing I made to play around with boss AI.

Random idea I had, if the boss is too easy on one difficulty and too hard on another, why not add an HP multiplier option for it?

Me: Sees this
Me: Oh a boss that doesn't come with much more and won't crossfire with more major mods
Me: uses it with every content mod playthrough
Me: Why boss so easy?

Cool!

I was playing in Master mode, using hallowed armor with a Chlorophyte Shotbow and the Super Star Blaster (idk the name, just that it is an upgrade to the Star Cannon.) I personally didn't have a *big* issue with the arena as I used Fargo's city buster to make space, but mining out a large space underground in the corruption sounds like a nightmare to do manually.

I can appreciate the effort put into the fight, especially as it is your first time with NPC AI. My own first boss was not incredible either, so I can cut you some slack. I just thought that the boss's movement was counter-intuitive with where the boss is fought, and that many of the boss's attacks were trivialized because of how easy the movement is to counter while in a large space.

Forgot to mention I brought Greater Healing Pots. (only used like 1) and Gelatinous Pillion (to avoid stunlock) for the test I described below.

Ok, made the adjustments.

Just to be thorough I re-tested the enraged Expert fight in a smaller arena than I normally do (85x50 instead of 117x60), while using a casual (Non-optimal) Pre-Plantera setup;
Hallow Summoner using Sanguine+Durendal (With Megashark + Chloro as sidearm)
Wings + Terraspark and SoC for mobility, Ankh Shield and CoM for defense, and avenger emblem for offense. Reforge prefixes were optimized, though (Menacing, Ruthless, etc).
Only buff was Well Fed.

The fight takes a while since I the loadout doesn't invest much in offense nor uses a strong sidearm. I only got overrun maybe twice, though, due to a bad transition out of Cursed Storm. The only attacks that gave me trouble were Cursed Storm and the Night Bombs since there's less space to back up and weave through.

Anyhow, I'll make it so the Core moves and turns a tad slower when not enraged.
Also, I'll note that the boss gets a notable speed boost when in Expert; if that was your first experience with it know that the classic fight is toned down in comparison.
I think I'll slightly nerf the Expert speed boost, too.

@Rough Laser Surgeon, the high speeds are meant to be countered by a circling motion, that usually trivializes most of the attacks. That said, even though it is naturally encountered underground, the recommended amount arena size is about the size of at least a screen, roughly 120 by 70 tiles (This is the arena size I tested in for all difficulties except enraged Legendary GFB).
I'm sure this gives a ton of people Plantera arena flashbacks, which is why I made a manual summoning item for the boss so you can fight it on the surface where there's more room, with the trade off of gathering materials and a mild enrage (Slightly faster and some extra defense). I personally prefer fighting above ground.

Regardless, I agree with your criticisms; it's not very fun or fair to need another plantera-esque arena just to fight an agile boss underground. This is my first go at making a boss (Actually, this is my first NPC AI coding in general), so the feedback is appreciated.

While I do respect the effort put into this boss, I feel it has some major design flaws. The most notable issue is that the boss is designed around being fought underground, yet charges at you at high, unwielding speeds for nearly the entire fight. While other bosses in the base game are similar, even fights like Plantera are more lenient with their movement. The Corruption Core either needs to be slowed down significantly for most of the fight, or needs a change in movement that makes it more fair to fight in the smaller spaces provided.

A suggestion I would make is to have the core move in zig-zags towards you, stopping briefly after each movement. It would make giant arenas less of a necessity, while also making its standard projectiles cover more space at they are fired out.

oh cool, a hardmode evil biome boss

@baconmaxf, I was considering adding an enrage for the Hallow. Honestly I kinda wanted to have some sort of masochist-esque enrage with a special drop to match EoL having Terraprisma locked behind her no-hit fight.
I ended up not adding an enrage since the boss doesn't have an entirely predictable attack sequence like EoL or Duke Fishron, so it wouldn't translate very well to any sort of no-hit style or masochist fight since you can't fully know and prepare for what the Core might do which could lead to some BS hits (By comparison, it's possible to always know what EoL or Duke are doing so you can always be ready to dodge them properly).
If you do want to see a much harder version of the fight, try summoning it on For the Worthy or Get Fixed Boi.

You should make it get fuckin PISSED in the hallow

oi, cool, i guess.

If you do find anything out, lemme know just in case there's something I can do about it

@Asgore, if you have a lot of mods chances are there's some sort of compatibility problem going on... If you want to figure out what mod(s) aren't cooperating with this one you'd probably have to go through the process of turning them off one at a time, though that's obviously very tedious in this case.

I do a heavy modded playthrough, everything is fine, game running at 61 FPS, when i add your mod, BOOM, 1 to 5 FPS

ham, cheese, italian bread, and some mayonnaise on my sandwich

@Asgore, I haven't had any problems with it so far. Could you give more details?

When i use this mod, the game is so laggy...

This man returns and he still cant miss a singular beat even if he tried

alright sick thanks for letting me know so quick

@Snaxa~❤, it's perfectly fine to add this in mid-playthrough. Keep in mind the boss is balanced for roughly post-Plantera. Likewise, its gear drops will probably be outclassed by late post-Plantera/Golem gear (Ex: Empress or Duke drops).

Just out of curiosity would it be safe/fine to add this mod into a playthrough thats currently ongoing? or would it break things and i should use it only on a fresh playthrough.