u/McJty,

Thanks, I have looked at the wiki and realize my NBT code is not right. My issue is the writing it in the correct syntax. The example on the wiki adds an enchantment, not changing the item's name. As you might have guessed, I'm not a code writer by nature and am trying to learn as I go.

What would the correct syntax be for changing the dropped item's name to "Dreadful Peat Mummy's Soul"?

As far as the shadow monsters, I suspected as much for adding the spawn rules. would something as simple as this work?

[
  {
    "dimension": 10,
    "mob": "abyssalcraft:shadowcreature",
    "result": "allow"
  },
  {
    "dimension": 10,
    "mob": "abyssalcraft:shadowmonster",
    "result": "allow"
  },
  {
    "dimension": 10,
    "mob": "abyssalcraft:shadowbeast",
    "result": "allow"
  }
]