Keep in mind that atm you code will make every person and NPC in zone do that, might want to add some distance checks and maybe check for being a pet of a client or bot in the NPC loop. Also that doesnt work for bots(if you wanted to include them or not).
You could get the mob list and then only have to do one loop with all your logic for different cases inside that.
Also if you dont want them to actually cast the spell, use CastSpell(xxx, blah, 10, 0, 0); the 10 is slot(not really important except its not a spell gem), then its cast time and mana usage or vice versa.
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