Overseer - It can't attack but can shoot out little flying helpers to attack for it, unlike ( regular seer's ) the Overseer acts as a more commanding role, if any hydra or hydra forms are nearby it can command them to attack the enemy that is shooting the Overseer. When low health, it will try to tunnel to a safer location on the map. it is able to take 3 explosions than the normal hydra. it is able to spawn up to 6 drones.

Drone - a Drone can only be spawned by Overseers or in the spawn menu, they are little flying things that will attack any enemy That's shooting or nearby the Overseer. if spawned by the spawn menu and there is no Overseer, they will just wonder around and attack anything that gets to close or shoots at it, when you spawn a drone and then spawn a Overseer that Drone will immediately go near the Overseer in an act of protecting it. how it attacks is simple it try's to dive bomb the enemy. it also does low damage. they can not spawn out of an egg.

seeker - the seeker will be always underground until its next to his prey seeker will pop out and stab the victim until he is dead also seeker can move underground you can see it because there effects of stone dirt and wood that all for my suggestion its small and die too pulse rife (ar2) shotgun magnum and explosive

Distributor - The distributor has low range, but always gets a grasp of it's enemies 100% of the time, unlike it's relatives. IT IS RECOMMENDED TO BE AROUND OTHER HARVESTERS TO INCREASE EGG PRODUCTION. Once it takes grasp of the victim, it will either: 1: tear the limbs apart and give it to other hydras near it, or 2: simply hold the victim in place and let it's partners peck at it limb by limb. This is why it gets its name the Distributor, because it shares the consumption of the victim evenly among its partners.

Colony: Not any new community-made variant, but instead a regular hydra, a smacker hydra, and a seer hydra in a colony. Hydras were described as being colonial organisms during HL2's development anyway.

hydra boss:can enter the ground and come out of the ground trying to predict where the player is, also make it get props around it and throw it at the player if it's out of range.

Hornet - has a honey comb like head, it can shoot little pointy shards of biomass that do low damage but it rapid fires the shards. it cant and won't melee attack, and will hide when enemy's are too close for its comfort. but has a 15% chance of shooting all the shards at once in different directions ( like a shotgun ). but also has longer ranges than ( the normal hydra or hydra forms ).

Pulse - this hydra has spikes on its back that have electrical property's. it can create a pulse of electricity ( AOE attack ) and stuns every enemy within the radius. the pulse can also insta-detonate rockets ( the pulse has a big radius ). shooting pulse balls at this hydra makes the electrical pulse have a higher voltage ( making it do more damage ).

Brute - this hydra will be bigger the others and it will have a lot more health it can shoot biotraps out of the ground the head is shaped like a smacker head it can summon other hydras and it will mass produce eggs when it kills

biotrap - biotraps are a trick biomass when a player gets really close to it it will kill them and become bigger

queen-shoots out eggs

worker-gets dead bodys for the queen

Hivemind - The center of most hives, the hivemind acts like a nexus and brain, relaying information and giving orders to any member of the hive, as well as being connected to all hydras inside the hive. Hydras in the vicinity of it will try and grab bodies and feed them to the hivemind, feeding the hivemind corpses or food gives the hydras of the hive a reward in food, and also feeding the hivemind will make it gestate eggs. Generally is also found near Nucleus's.

Worm - Similar to specimen 8's idea of the Seeker (I was inspired by it), the worm is a small hydra than can dig through most surfaces. It has a head of a Stinger and also small needles similar to Piercer heads on its body incase the prey tries to get too close for comfort. Rebel forces have found that apparently the Worm is quite similar to the Stinger, and was created to catch prey for the hive when its hungry, but are too far away for the hive to reach. Also the worm isn't attached to a hive, which allows it to go far distances away from the hive, while this might seem like a problem for the hydras because "Then how does the Worm survive?". Certain cameras have found that there are special parts of the hivemind that are designed for worms, allowing it to suck on the nutrients from the hive.

Mantis - This is a quite different hydra form than the ones most have encountered. The Mantis got its name from the fact that it has two claws attached to arms, this allows it to catch prey that are hiding behind cover or too far away to reach. The mantis also has a head that has a giant singular eye in the middle, giving it a better view about its surroundings, although this also presents a problem which is the fact that you can damage the eye causing it to go blind for a couple moments.

Golem - this hydra is a tough humanoid figure. scientist arn't sure on how this bulky looking hydra has evolved to have legs, hands, and even a head, the spike that was once its head is now a is on the end of its new tail this thing is really strong able to take 10 rockets before it dies. but some say that hitting the head with a rocket will insta-kill it, but thats just a theory right? Golem's act as guards of the hive.

Hocker - This form covers range attacks as well as "crowd" control. The hocker has a head of a Smacker but instead of 4 points it has 3, where it got it's name from is the fact that it can "hock" corrosive bombs at intruders. These corrosive bombs look like eggs except the green translucent membrane in the middle is replaced with a toxic light green substance that can burn down to flesh nearly immediately. They are generally found on the outskirts near the hive, or near some of the entrances.

since the using corpses thing is a theme hydra farmer and shooter would be cool, as a shooter would strike, use a consumed corpse and then fire a retextured crossbow bolt, doing large damage, and a farmer would be able to drag ragdolls and corpses to be used as food for the hive, or if we want to get a bit fantastical they'd be able to place a small hydra sprouting from the back of an npc, that npc having a zombie animation set, and being able to both claw and use its hydra appendage, if we aren't trying to retain canon of something that was never added