I have looked through the heretic folder and I found that spider enemy in the "unused boss" folder. About the custom boss issues, I suggest you join 2 Isaac discords (links are below), since there are many excellent Isaac modders, I think someone will help you solve the issues.
https://discord.gg/tWZWwP7g
https://discord.gg/DUvjk4Ky

@yuqingzhitian can you describe how that spider looks more please? Custom bosses intro not work anywhere. I dont know how to fix that

I want to ask if this mod includes a spider enemy suspended in the air by its silk, its attack mode seems to be broken, only attack animation, no actual attack effect. In addition, when I enter the boss rooms after stage 10, the cutscene (boss UI) doesn't show and some of these mod final bosses only have some animation and sound effects but no actual attack effect or something else, which I'm not sure if are bugs.

@limbsonthefloor agony will be uploaded soon, ive checked out every enemy this mods adds and replaced ids on some enemies to make them work. but i gotta replace enemies in basement renovator

is the agony port being worked on? i haven't seen anything in a good while so i'm just curious

If you want you can continue from where I left off.

@infernalthing you write like you did lotta things so what can i do?

I could send you the current build to make your work easier. I already did things like separating the extra rooms to the content folder, Basement Renovator support, the entities2.xml file in content and such.

@infernalthing i will look myself and call you when im gonna start work on agony mod

It mainly needs some tedious ID number changing for some monsters. Like, there are enemies based on Frowning Gapers that act like normal Gapers, meaning they don't open up their eyes and gain speed like they should. I know how to fix that but changing IDs means they also need to be changed in Basement Renovator and in the room files.

@infernalthing you got some troubles in your agony port?

p.s: it's called baptism of demon, not blasphemy of demon

oops

Hey, I wanted to let you know that some time ago I worked on porting Agony but got caught up in other things. I was thinking I could make your work easier if we collabed, since a lot of my Agony port is already done.

@LЁVKA8 the bee is MEANT to attack like pestilence, i know bc i played the origional mod and have encoundtered that anamy

@limbsonthefloor i dont know what ill do with bee, when i replaced id it started to attack like pestilence. ill do rocks textures soon

great! most of the enemies are now fixed

only the bee enemy is left (63.2), the id it's meant to have is (64.2)

and also the fool's gold rocks and likely all the other gird objects that are from the repentance update have no sprite, they're invisible, and same you go for the godmode mod too

Alright, ill check out the blasphemy of demon after i port agony which i gonna port after i finish fixing this one mod.

about that mod named blasphemy of demon (https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1122279139) , I also hope you could update it, since its creator is the same as heretic, I think there is no any problem if you update it. In addition, there is another mod named quarry (https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1177606654) , hope you could update it too if possible.

oh man I remember this mod; kinda miss this era of mods ngl, had a weird charm

also i just have a suggestion for one mod

it was one afterbirth plus but was structured in the same way as an old afterbirth mod
it was called blasphemy of demon and i've heard the mod's creator is kinda dead so just wanna point that out

it you don't decide to port it in the collection it'll be fine

great!, there is a few still broken however, lemme just list em

no AI
20.1 (monstrhino)
20.2 (stone monstro)
63.2 (bee, i think it has to change ids, from 63.2 to 64.2
228.2 (stone bony, you did fix it but now the stone bony is broken and now taking place of the origional broken one, it has to be variant 227)

has no shoot trigger
38.1.10 (seraqph baby, i made a typo and put in 36.1.10)
38.2.10 (psy baby, this one might teleport alot more often)
90.2 (horf II, but only the version that's a boss)

and i think that enemy 88.0.2 (monsto grimace) needs to have more shoot triggers

that's it

also np for the list :)

@limbsonthefloor thank you very much again for this list of enemies. i have fixed all of them except the ones who becomes into poop. i dont have much time to play and test for now so it speeded up the progress to get perfect state of the mod.

enemies are simple fixeable but its a weird. for some reason in past version those enemies was shooting without "shoot" trigger somehow

@limbsonthefloor thaanks very much for the report, ill check out.

oh and here's a small list of enemies that are broken in their own ways

doesn't shoot (it moved around and even did shootinjg animations but nothing happened, exceptions to certain enemies that were intended to not shoot)
36.1.10
22.10
26.2.1
56.1
57.0.1
81.1.1
86.1-86.4
88.0.1
88.0.2
88.1.1
90.1
90.2
91.1
98.2
99.1
205.1
223.1
242.1
247.0.1

doesn't have AI (just slides around)
63.2 (this one is a famine variant and i think it's meant to be a pestilence variant)
228.2

has AI but doesn't move (just stands still
100.2


has AI but has no head and is on ♥♥♥♥♥♥♥ crack
227.2

they became ♥♥♥♥♥♥♥ poop
245.1
245.2
245.3

they moved then just stopped moving
260.10.15

the monstro ariants are a bit ♥♥♥♥♥♥ up, they just stay in place, jump up , and never come back, their hitbox is actually still there tho, but it has no ai, it just gets pushed around like skinless hush

next port's out :D, i assume the next'll be agony right?