NCF – Extended list of Neutral creatures.

Hello everyone!
I decided to try making a new creature for my map, tied to the scenario's storyline - a wild nightmare (5th level)
Description:
"Wild nightmares are rarely encountered in Ashan. These beasts are so fierce and unpredictable that even the demon lords cannot always tame them. Legend has it that the demon lord Kmolag managed to win over these inhabitants of Shio to his side during the Eclipse, but since then no witnesses have remained to confirm the authenticity of this event. Wild nightmares are incredibly fast, and once they build up speed, they can deal colossal damage to the enemy. In addition, their attack can curse the enemy, increasing their vulnerability to the element of fire."
Abilities:
Living creature, demon, large creature, fear attack, aura of terror, immunity to mind control, charge attack, mark of fire

I want to thank user BlueHeavenHero for help and advice!
In the future, this creature may be released as a separate file for NCF, after the map is released

let's say I downloaded one particular creature, what next? how do I plug it in so that it generates on the adventure map and what about their quantity? I have NCF_Creature and NCF_Core. I don't want to download whole packs, because I don't need everything, just select creatures for my mod.