What DC would be used for 2024 Charm of Animal Conjuring (no listed DC)?

What DC would be used for 2024 Charms that don't have a listed DC (such as a Charm of Animal Conjuring's casting of Conjure Animals)?

I can see the following 2 options, although neither quite fits.

Option 1: Use a set DC:

Earlier (Pre-2024) Sourcebooks:

• DC 16 (Candlekeep Mysteries)
•   Charm of the Shadow Glass
• DC 15 (varies)
•   Charm of the Mirage (Candlekeep Mysteries)
•   Dark Gift of Norganas, the Finger of Oblivion (Curse of Strahd)
•   Charm of Euryale (The Book of Many Things)
•   Charm of the Gem (The Book of Many Things)
• DC 8 + your Proficiency Bonus + your Intelligence, Wisdom, or Charisma modifier (The Book of Many Things)
•   Charm of the Jester
•   Charm of the Moon
•   Charm of the Puzzle
•   Charm of the Rogue
•   Charm of the Skull
•   Charm of the Star
•   Charm of the Sun
•   Charm of the Talons
•   Charm of the Throne
•   Charm of the Void
• DC 8 + your Proficiency Bonus + your Intelligence modifier (The Book of Many Things)
•   Charm of the Sage

2024 Sourcebooks: So far, none of the newly revised core 2024 rulebooks or subsequent 2024 modules introduce new supernatural charms with unique hardcoded DCs.

Option 2: Use the 2024 rules for Magic Items:

• A magic item may require the user to use their own spellcasting ability when casting a spell from the item. If the user has more than one spellcasting ability, the user chooses which one to use with the item. If the user doesn't have a spellcasting ability, their spellcasting ability modifier is +0 for the item, and the user's Proficiency Bonus applies.
• DC 8 + 0 + Proficiency Bonus

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A Supernatural Charm is a blessing bestowed upon a soul, not a physical Magic Item, meaning the specific Magic Item rule regarding a +0 modifier does not directly apply by default. Because the core text for Charms simply says "you can cast the spell" without specifying a unique hardcoded DC or a specific ability score (like Charisma or Wisdom), a mechanical gap exists for non-spellcasters.

My guess is that it would make the most sense to use the pre-202 ruling allowing the use of your Intelligence, Wisdom, or Charisma modifier (since Charms are not magic items).

I am looking for official 2024 rules (if available), rather than a Homebrewed decision.

Quote from Allinar >>

A Supernatural Charm is a blessing bestowed upon a soul, not a physical Magic Item, meaning the specific Magic Item rule regarding a +0 modifier does not directly apply by default. Because the core text for Charms simply says "you can cast the spell" without specifying a unique hardcoded DC or a specific ability score (like Charisma or Wisdom), a mechanical gap exists for non-spellcasters.

I am looking for official 2024 rules (if available), rather than a Homebrewed decision.

 The rules you have are all there are, and there is no defined DC or formula. It is not unreasonable to assume that the DC will be a property determined by the entity that grants the ability, but there's no official answer, just homebrew.