Create a hole effect and then cancel it out with a white circle around the player, which is just a normal light effect:
NPC Code:
seteffectmode 2;
seteffect .5,.5,.5,.1;
showimg 0, circle.png,screenwidth/2-(circlewidth/2),screenhieght-(circlehieght/2);
changeimgcolors 0,.5,.5,.5,.1;
changeimgvis 0, 4;
That should work x.X