Rise of the dark ones queen

There are many dangerous beings out there in the world. Dragons roam the sky, sea snakes rule over the ocean, giants rule the mountains, the great spiders occupie the great and deep dungeons, gigantic bull man live on the great planes, while poisonous frogs are in the great swamps, but there is one creature that is way more powerful than all of them together! This one creature know as the end of the food chain, the one that rules is none other than the Hydra it self. Unbeaten, unmatched and unknown to the humans, elfs, drawfs, rat man and fairies. The Hydras never had something to fear or to follow. Until the one Hydra decided to reach for the unreachable. The black crown of the Warhydras. A mysterious item that no body, not even a Hydra, had ever seen, but still he proceeded. Until he finally was at the point of reaching it when it asked for the ultimate sacrifice for a Hydra. The freedom. It wanted him to become the slave of the next humanoid creature he came across. After thinking for a moment the one signed the contract and so the Hydras had their first king ever. Now is the question who will it be? Who discoveres him first?