NHF – new heroes for Heroes V 3.1.

I'll correct that. I've already had a few issues with the nhf_ and NHF_ registers :(
In general, all NHF should be replaced with all nhf in all files (or vice versa). Basically, just click "replace all" ))

Added 9 minutes later
If you don't disable the monsters at the start, then it's necessary to describe this artificial bug where Hafad's special ability doesn't work :(
But opening portals is sometimes very important, so it's frustrating that the special ability doesn't work on such an important thing.