I still think hurling the whole necklace with more than one bead should stack more substantially. Definitely more than 1d6 for each additional bead if just one bead is worth 8d6 on its own, maybe even spread the AOE for a bigger, wider boom. I thought it might be something that changed with the 2024 edition, but I guess not.

The stack is dealing more damage in a shorter amount of time. You sacrifice raw damage to increase the initial burst rather than deal more damage over a substantially longer period.

A Thief can throw two per turn...

Can I use Multi-attack to throw 2 seperate beads or is this a no-no?  I'm just now coming into playing tabletop from BG3 and I know that uses legacy rules.  I assumed because you can throw a dagger in your inventory twice with multi-attack that it may work with this.  Any thoughts fellow DMs out here?

Quote from Fried_Circuit >>

Can I use Multi-attack to throw 2 seperate beads or is this a no-no?  I'm just now coming into playing tabletop from BG3 and I know that uses legacy rules.  I assumed because you can throw a dagger in your inventory twice with multi-attack that it may work with this.  Any thoughts fellow DMs out here?

 No, because it's a Magic action to throw one, not an attack action.  You'd need a way to get an additional Magic action on your turn to throw two, for example, like someone stated above, a Thief, who can use a Magic action as a bonus action, could throw two.