Workshop

The game will end when a winner is definitively determined.

That's the essence of the question. Let's say we have 2 townspeople, 2 members of one cult, and one member of another cult left. Is the game over, or not? Or, the most interesting scenario, 3 people: town/cult1/cult2.
Added 5 minutes ago
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I liked the idea of introducing it for balance.

No, I wasn't suggesting that. We shouldn't introduce it for balance. It's better to give out the pieces at once and assign a check to someone from the neutral side, which would randomly determine the owner of a piece of the amulet and/or at least inform those who have a piece of the amulet that they have it. Not necessarily immediately, for example, on the second or third night.

Added 1 minute ago

I'll put a limit on the cultist blockers, no more than once per target.

And put a limit on the Mafia's block as well, what makes it better?

Added 3 minutes ago

You can't reveal your role in the thread.

What's the punishment? Immediate modkill, a warning, a team loss, what exactly? From my point of view, you can break the ban if the benefits from it outweigh the consequences. And will the punishment be different if you reveal not your own role, but someone else's? (hint: it shouldn't, otherwise, by the fact that there is no punishment, you can guess that someone was lying)

Added 7 minutes ago

I can remove 1 Mafia role for balance and add a recruitable peaceful role.

Will it be 9-4-1-1-1-1? This is already too much in favor of the Mafia. If there were no clues, then okay, more than a quarter of the Mafia. But there will be clues. It probably wouldn't be a good idea to make it less than 1/3 of the Mafia.

Added 11 minutes ago
I still don't understand the Cat. So, he collected the amulet and won. It turns out that the others lost - or will they play for their own victory, independent of the Cat? If the Cat is alive, but hasn't collected the amulet, and only the Mafia remains, does he also win? The meaning of playing as the Cat is to not die and not let the Mafia find the amulet, and that's it, that's a victory, right?

Added 4 minutes ago

Usually, this means that the observer learns the result of the Night Phase even in case of their death.

So, the observer, who is a member of the Mafia and was killed, manages to inform the team of the result, is that what you mean?