the light monster

this is a unique mob that slowly dies when below light level 3. it is a hostile mob that in the overworld spawns underground. During night it follows players who have torches in their hand or inventory, and attacks the player to get that light source, It also likes to eat torches placed down and after they eat a torch they are immune to the dark for a certain time and turn neon yellow that fades away after the effect is over. but it is scared away by Redstone torches and spawns below y=0. they can crawl on walls and are very fast. these monsters sense all sources of light and when killed they drop a special item which can be used to make cool things.