>>532405387
If you need the characters to be interacting with each other often in one reply, like for example if you want 2-4 of the characters to give their input with the same reply, then you should either:
1. Describe each of the characters briefly in the description of a single scenario card, so they are always in context.
You might go this route for a threesome trio card for example, where their interactions together are the point.

2. Describe them VERY briefly in a single card's description then have their full description in lorebook entries that trigger when someone is mentioned by name.
I have a harem scenario where the rules of the world are described in the description of one card, with greetings message that are character-agnostic, and I can mention the name of anyone I want to RP with to bring their lorebook entry into context. (picrel)

If you want to interact with each of the characters individually and they're very fleshed out, you can make a group chat, which is option 3. In this case you'd want each of the characters to use the same lorebook describing the setting, and probably but some key details in each of the cards (duplicating information).

Bear in mind that in a group chat, each time the LLM is generating one character's reply, it won't know anything about the other characters except what is in the chat history, unless you change a setting to make all cards be always in context.

You can also insert a "scenario narrator" card which explicitly moves the action along, with instructions about what it should say when it's up to speak, or you can do it yourself by setting your persona to "Narrator" and typing what you want to happen next. The group will follow your lead.

For a LOTR setting, even a stupid AI probably has enough of the source material baked in that you can afford to be very light, so I'd probably go with Option 1 if I was you, and switch to Option 2 if the description gets too big and bulky