What is the most powerful mythological creature?

It is an opinion on who. I will name some of the monsters I know of.The 3 headed dog that protects the underworld, Ceberus, The Hidra, the dragon with 3 heads, but if you cut one off 3 heads grow back in, a centar can be sort of wild, the are half Man half horse, Spinxes, and more but I really do not know much.