Wasnt sure if this should be posted in rules or advice, so please don't hate me :3
I've got a campaign going, with a big emphasis on being a little spooky. Easiest way of doing that is to keep my party guessing on what is going to attack them. They've got a few dungeons to crawl that will be very dark, and the players will have to bring the light source. The idea i was toying with was to have the monsters remain just at the edge of light, afraid of the flame. Then, when the party sets off a water or wind based trap, the monsters scurry in and attack, only to flee when a new light source presents itself. My question is this. How is the best way, on the grid, to show how far a players light travels, without revealing a portion of the dungeon they have yet to explore?