Tarrasque

The tarrasque was an enormous abomination, roughly the size of an ancient dragon, with two long horns extending from its forehead, a thick carapace, mighty tail, many spikes covering its large body, and a wide, toothy maw. The tarrasque also had two small eyes, but it did not rely on these for its primary method of sensory perception—if they were blinded or removed, it was effectively unhindered. The tarrasque was impossible to frighten or charm and had resistances to every kind of damage imaginable. It moved at a speed roughly half that of a human, either while walking on the surface, climbing a height, or burrowing through the earth.