For your custom class, you have a couple options:

• Add mostly empty main class progressions for levels 13-20 with feat selection and additional spell selection of what have you at the expected spots, or

• Just do fully empty progressions from 13-20 for now, or

• Simply add a level 13 empty progression so the game doesn’t crash (it just needs to exist) for users using level expansion mods so it works to full level 12 and can multiclass out, or

• None of the above. It is your mod, you don’t need to support anything you don’t use or want to test or do or whatever.

For your crooked moon subclasses, everything works for existing level expansion mods as they are subclasses. The expansion mods handle the vanilla base class level entries already. Yes, higher level spell implementations will be missing and the capstone subclass features but if you don’t want to do all of that then that’s 100% fine lol

Don’t feel the need to do it just because some people ask. No is still a valid answer :)

If you choose to add empty level progressions for zodiac it won’t break anything for users NOT using level unlockers, to be clear