Those are just 3 monsters, but there could be a lot more of them coming in the future and that sparks the imagination to a point where we find ourselves thinking about other monsters that could appear in the game. For now let's see 3 of them.
Note: Don't take these as full featured ideas. They are just a imaginative glimpse of what it could be if these monsters were in fact included in the game.
Story for the monster:
The Unicorn could be a mutation caused by the dumping of chemicals and radioactive materials caused by an accident on a forest facility. The creature would be born of these mutations as the local fauna got contaminated. This creature would obviously look nothing like the mythical one as it will be twisted and deformed and its horn could have a form different from what we are used to see.
An open facility found in a dense forest. This forest would be most likely covered in fog and will have places where the contamination is just too bad for humans to go in. This map would have several human outposts and natural places like a basin and a small system of caves to help the humans move around dangerous areas. In the human outpost there would have some devices that could be temporarily activated to help keep the Unicorn at bay or even hunt it down.
Unicorn would have its original equine form (horse-like features) with one big horn as the mythical Unicorn does. It would have blinding speed and use this horn to impale its unlucky victims. The creature would also use its hind legs to kick hunters and send them flying and lay on the ground (like a sleeping horse) to hide in the foliage. Unicorn would get even faster as it evolves and would get new powers like throwing lightning out of its horn and been able to jump and do a lunge attack. When the Unicorn gets to its highest level it would be able to use its own grown body to damage its opponents by just running through them without having to use its horn.
Fast speed, stealth
It becomes vulnerable when failing to hit with a horn or lunge attack, questionable defense.
When hunters are pitted against Unicorn they should focus on slowing him down a little so they can damage it. They do so by using some left over mechanisms that are found on the human outposts in the forest. Humans could use the small cave systems to move around, but would not be able to camp there because toxic fumes would fill these passageways from time to time. So they have to move fast and set a perimeter on these mechanisms so they can trap the Unicorn in some sort of time continuum breaking laser barrier that will slow the creature down a bit. They will also have to protect the mechanism from been destroyed by the Unicorn because once it is gone, they will have to hunt the creature while it is a full speed for the rest of the fight.
Story for the monster:
The Hydra would the result of thousands of years of artificial inter-species breeding of aquatic and terrestrial animals. Human scientists were basically playing with genetics until this beast was conceived and escaped the controlled environment, hiding in the deepest parts of a giant lake. Several years later the Hydra resurfaced and caused a disaster on a special facility that was built on this giant lake. Now humanity has lost everything that they have learned on this research because the creature doesn't let anybody to get near the facility so that is when hunters come in.
The Hydra would be the walking/swimming type looking sort of like a dragon with multiple heads. It would start as something big, but not that menacing to the hunters. It would be able to swim really fast underwater and shoot toxic or fire out of its heads. On land it would be a lot slower, but would be able to attack with its tail in addition to the toxic/fire attack. As it evolves it would be able faster on land, learn a third attack from its heads that could be a water blast or something similar and also be able to do lots of damage by biting with its heads. On its final evolution it would become huge and be able to ram the platforms on the lake so hunters would have to be very careful of where they step in. It is also important to say that the creature would breathe oxygen from the surface, so it cannot just stay in the water for too long.
Proficient at swimming, abnormal body size, good defense.
Slow speeds while on land.
The map would be a facility that goes around the whole lake with several "pads" on the lake itself. These pads would provide long distance harpoons that can be used to strike the creature down. On the facilities around the lake, the creature would have several spots to get out of the water and into the facility itself as well as tunnels to get back to the lake.
The strategy here is to be able to keep the creature at bay long enough to be able to use the harpoons. The effort really involves the whole team because this creature can cause a lot of damage especially when on its final evolution where it can ram the pads and throw hunter to the water where they are easy pray. First, they have to activate the harpoons by restarting the generators inside the facility, then they have to run to the pads as fast as they can and coordinate an attack.
Xenomorphs (Alien Queen)
Story for the monster:
Many of you know what Xenomorphs are like, but in case you didn't know they are a vicious alien species featured in the Alien movies as well as the Alien vs Predator ones. The explanation of this creature appearing in Evolve could be something as simple as to say that a human colony ship was in the wrong place at the wrong time. In this case a player will play as an Alien queen that is pregnant and stuck in the middle of the map, sending its children to protect her.
On this case the player would be able to use different types of Xenomorphs, each with their own attacks. In the beginning, the alien queen will just be able to use the common Xenomorph that everybody knows, but as it "evolves" it will be able to use stronger types that will make things more difficult for the hunters. In case her minions fail to stop the hunters and they get too near, she would have her own attacks that she can use to defend herself until the hunters get far enough for minions to be effective again. Her minions can also damage the self destruct mechanisms by throwing acid at them and that would force hunters to fix them, giving the queen a break to pick them off. The cool thing with the alien queen is that the player will be able to have up to 3 minions roaming the place at the same time and would be able to switch them at will. When a minion is not been used it would have a normal A.I that will keep them roaming the place, but will be completely open to attacks.
Send up to 3 minions to do her bidding, her own attacks are quite strong
Not been able to find and stalk the hunters in time could make it very easy for them.
A human space colony that is now a wreck as the Xenomorphs have claimed it. It would have several corridors and rooms including air ducts and sewage disposal tunnels. The Alien queen would be right at the middle of the map and from that point it would be able to send her minions to protect her. The map would have 3 places where the colony's self destruct mechanism can be activated as well as places where hatches can be opened, sending any unlucky fellow (hunter or creature) to the vacuum of space. These hatches can be activated by either human or creature.
The main objective is to destroy the alien queen and this can be done in one of two ways. The hunters can tackle the queen head on in quick attack patterns until it is destroyed or try to activate the self destruct sequence and get out of there as quick as they can. It is a test of speed and consistency because the team would have to be very fast and precise on what they are doing or else the queen will get the upper hand and overwhelm them.
These are the 3 creatures folks, but if you have any other ideas you can share them on the comments section below as imagining stuff about a game is always fun. If Evolve manages to give us lots of creatures and also lots of hunters, it will be an epic experience.