Baby Truffle

The  is a pet added in the 1.2 update. It is summoned by using a Strange glowing mushroom, which can be purchased for 45 gold from Truffle.

The Baby Truffle is a passive creature and is invulnerable to all sources of damage. It will follow the player on foot if the player is running, and will teleport to your location if you travel too far away. It can't fly.