I corrected it by dropping the com file instead of the whole delver modloader, but somehow I still haven't found the NPCs in the breach. IDK why. I uninstalled other additional chunks mods just in case. Maybe next time. It's really weird that it still isn't working

Yes, I mean the NPC could literally be in a wall. However I checked your mods and Delver+ does modify the breach. But not in a significant way. You should still be able to find the NPCs with that mod. So maybe you just installed the Delver ModLoader wrong?

And do you mean the npc literally might be in a wall?

Hmmm
I see- one more question- he spawns at the entrance to the lost city (the skelletons and lava level) or does he appear somewhere else?

I specifically designed the mod so that the breach and the well can be modified and the NPCs will still spawn. But it's possible that the levels were modified so much that the NPCs are hidden in a wall or something.
I just did a quick test run with those two mods you mentioned and the knight does appear in the well level. So the mod is working. I didn't make it to the breach so I'm not sure what the issue is there. It very likely is an issue with one of your mods but I don't have the time to test it. I hope this is helpful.

The problem is- I died multiple times and beat the game once and the NPC still didn't spawn.
I also have DELVER+ installed and a additional levle mod- the library - is it something that might be causing problems?

No, the order of installation shouldn't matter. First thing I would do is make sure the mod is enabled in your mod list. If that doesn't do it it's possible that you entered the breach before installing the mod. Once a level is generated it caches it for that run and it will always be the same unless you die, win, or start a new run. So if generating a new breach doesn't spawn the NPC for you try going over the installation process again.

Hai, I installed the mod and the ModLoader but I don't see the NPC this mod adds.
The screenshot shows him in the breach area, but he didn't spawn there- what did I do wrong? Do I need to reinstall the mod after installing ModLoader?

Okay. I added a tutorial video.

You should definitely put a tutorial or quick file location requirement in the readme for the modloader. I am scouring the whole gitlab to find clues to where to place the files for the modloader to function. Thanks for any response!