If you were a mentor, I'd suggest an API that only shows a cone (instead of circle/square) for an aura. That would be the BEST answer, in my opinion -- if API can do that. Not being a writer, I've no idea if it can or not. Without API, I'd try fiddling with dynamic lighting and give the NPC the ability to shed light in its FoV. That requires going to the Advanced Tab for the token settings and tinkering with the Emits Light section. However, this will only work if the area around the NPC is dark or dimly lit -- any light it generates will interact with other light sources on the map. I suggest waiting and seeing what some of the geniuses here come up with, but hopefully I've given you an idea to chew on!
