Hydra-Greymon is an Dark water serpent digimon based on the Lernaean Hydra and the Sea Serpent. after many years of being mistreated as a Goblin-Greymon it started to show it's true power of a virus type digimon and became more aggressive toward other digimon and will attack most digimon it walks or swims pass. having become a Ultimate level it's body has perfected in a way so it can stay under water for as long as it wishes and a deep down as i wants to go. it attacks other digimon by using a jaw which can bite though almost anything, it's claws have become razor sharp allowing it to slice though rock with one scratch. it old tail has grow and became a major threat to most digimon due to the fact that the tail has small teeth on it making it razor sharp. it has evolved two more heads on it's body giving it the power to attack more than one foe at once, the left head show dread the middle head is the alpha head and shows pride while the right head shows anger. during it's next digivolition it will lose those two extra head but will gain of the smarts and power the other heads have.