That tutorial has not been completed (or... started, for that matter), and probably never will be. If I do decide to come back to this idea at some point, I'll probably just start from scratch instead of trying to update this mod.
Hey @minecraftstorymodefan, a word of advice: if someone answers your question/request/whatever, you should read the answer in full, so you don't ask/request something that's already answered and thus annoy the people who are helping you.
yes there's supposed to be an undead core figh- wait what
oh god damnit did i break it
edit: you're using v1.61 right
edit2: problem has been reproduced and fixed. noticed a few more minor annoyances, get ready for 2.0
DO NOT USE, DOES NOT WORK CORRECTLY!!!
Allows easy addition, removal and replacement of ORGs.
Download: Latest always here!
Changelogs can also be found there.
How to Use: "Help" -> "Add ORG Guide".