Cetus 

Origin: 

In the myth of Perseus and Andromeda, Perseus was his way home from beheaded the gorgon monster, Medusa, when he saw a beautiful woman chained to a rock and facing imminent death from being eaten by Cetus. Cetus was a sea monster sent by Posiedon to bring terror to the kingdom of Aethiopia, because the queen bragged that Andromeda was more beautiful than Nereid sea nymph. To get rid of Cetus Perseus took out Medusa's head showed it to Cetus(say cheese) and turn it into rock.

Logic:

You brag about being more beautiful than God. You recieve a monster as gift.