Slithering trackers live in dungeons, ruins and dark places. They are transparent and if not in natural sunlight are almost impossible to see (1 in 20 chance of spotting). They almost never attack their prey immediately, instead following and waiting until their target is asleep. They can follow through almost anything, being amorphous in shape and capable of seeping through tiny gaps, such as door jambs or cracks in stonework. If a slithering tracker catches its victim asleep, it will touch it, forcing the victim to roll a saving throw vs paralysation or be totally paralysed for 1d6 hours. The tracker will then feed directly on its victim’s life energy, killing it in 1 hour.