I will assume there being three pillars and two leylines as intentional. I guessed correctly and found the third pillar on the first try. :D
The UV light mechanic is a cool idea and implemented perfectly. But it makes lantern useless. If it had longer light and there were obstacles that required you to see them from further away in order to avoid them, it would make it relevant. Adding a little bit of time to switch and stamina cost would help too.
Also, great sound!