Baby Truffle

The Baby Truffle can be spawned using the "Strange Glowing Mushroom" bought from the Truffle NPC, it costs 45 Gold and all it does is follow you around, albeit very slowly. Unlike other pets, the Baby Truffle will not fly to you should it go too far away. Instead it will simply teleport with no particle effects.

However, since the Baby Truffle is a Glowing Mushroom, it does provide a small amount of blue light, making it somewhat more useful than other pets.