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The trigger mechanism of Prototype Personnel Decimator seems to be RPPM. (source: arkmrrobot website)
Multiple targets or damage sources wont increase trigger chance of RPPM trinket.
Thus this WA isnt that helpful. All you need is a range display UI and make sure at least 1 target out of 6-7y range.

Thanks for your reply, and good work , Galinhoo! I have my original version of weakaura to share. Instead of your version which only shows enemy counts between 10-15 yards, it constantly Show you how many enemies within 15 yard range (Note: Arcane explosion has 14 yard cast range) There is also a we...

Here is a good example I found on wago.io. https://wago.io/rycHBJxSG He made a custom trigger to monitor how many enemies within 8 yard range (for whirlwind) by using lua langeuage "IsItemInrange". An item's ( "burning torch" item ID:33278) use/cast range is exactly 8 yard which simply matchs whirlw...

Here is a good example I found on wago.io. https://wago.io/rycHBJxSG He made a custom trigger using lua langeuage "IsItemInrange". An item "burning torch" (item ID:33278) use range is 8 yard which simply matchs whirlwind cast range. That weakaura works even if you dont own that item. I googled wow i...