(Claytonian JP suggests, excellently: "Each leader's skull has the route etched out upon it. Not that anybody has ever been allowed to see a decomposed leader...")
TRAP: Anyone opening a tiny latch on one of the links of this chain will instantly be transmogrified into a tiny golden figure of themselves, with the links they openend as manacles. If a creature-charm was already "in" that link, the previous creature will be freed and returned to normal, and the opener will be trapped as above. If the necklace is thrown as the latch is opened, roll 1d8 below:
1. The thrower of the necklace is imprisoned
2-4. The necklace bounces off the target harmlessly.
5-7. The target is imprisoned.
8. The thrower and target are both turned into tiny golden versions of themselves, but not imprisoned.
(I added the d8 chart just now.)