This video shows how to write a script that rolls damage for all the missiles at once, rather than one at a time, and will decrement the appropriate level spell slot.
The code is here - https://gist.github.com/nolivo/e1d32e...
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Watch video Creating Your Own Magic Missile: A Roll20 API Scripting Tutorial online without registration, duration hours minute second in high quality. This video was added by user Nick Olivo 16 July 2020, don't forget to share it with your friends and acquaintances, it has been viewed on our site 3,87 once and liked it 11 people.