How Starcraft could work if it would be real

The Ultralisk serves as the hard-hitting monstrosity for all advanced hive colonies. Ultralisks not only have unimaginably tough carapaces, but innately have the carapace equivalent to the first terran armor upgrades. Specialized armor upgrades exist at the Ultralisk cavern, which make a fully evolved Ultralisk practically invincible, and can easily absorb Terran damage classifications of 6. The Ultralisk generally leads the charge against almost every army, be it Terran, Protoss, or a rogue Zerg Brood. Their immense size lets them literally trample smaller enemies into the ground, and toppling foes of larger size. When assaulting buildings or other massive enemies, they use their bone-like scythes to cut enemies to pieces before they can deal any damage. They move fast enough that they can get into melee range before range before ranged enemies can take advantage of this.

The Ultralisks huge expanse of muscles, ligaments, and its killing engineered brain requires almost an entire Overlord to control. The Ultralisk gene has been extracted, studied, and replicated by Terran scientists, but to no avail. The only full code exists in the Ultralisk Cavern and the Ultralisks, the former used only to mutate larva into new Ultralisks.

Ultralisk Scythes are so gigantic that an attack against a single enemy also deals massive hurt to nearby units, which suffer damage from the in-stroke of the attack. Due to this, very small numbers of Ultralisks rip through small Terran units like butter, and the standard Marines and Marauders are notoriously afraid of exterminating a Zerg Infestation that has been left unchecked. Most kill squads sent to do this don't come back alive. Heavy firepower mechanical units need to be brought to deal with this.

Looking at a Hydralisk, even a weathered and experienced Terran Scientist wouldn't suspect that it was evolved from the docile herbivore, the Slothien Caterpillar. The original Overmind saw the hidden potential in this hapless and weak creature and mutated it into the subservient killing machine aptly named the Hydralisk. The armored crest behind its head houses a simple organ that produces Needle-like spines at a phenomenal rate, and the Hydralisk uses its extensive musculature system of nearly 4000 muscles to fire the keratin spines at speeds that pierce the toughest standard issue Neosteel even at maximum range. Marines are under direct orders to never approach massed groups of Hydralisks without support.

Unfortunately the slow wormlike movement of the Hydralisk makes it better fit as a defender, where it has Queen support and can move more freely on the creep of the Hive Cluster. It is also suited as an ambusher, unburrowing to catch an army when its not expecting to be attacked.

Hydralisks also have thick claws that allow them to pin infantry down and kill it, or deal massive damage by slashing enemies with its talons. Because the Hydralisk has all the muscles of its arm behind its melee attacks, it does as much damage at melee as its spines do when shooting enemies down at range.

The laws of physics state that anything invisible cannot see anything because the light that would reach the things eyes are passing around it. Throughout human history, this has been proven true. Banshees use specialized goggles that feed battlefield information to the pilot, and even though the pilot cannot see anything outside of the cockpit, him or her can still find and destroy its targets. Satellites pinpoint the banshees position and feed radio information through sensors on its hull, and vice versa. This way, the satellite is "Seeing" what the banshee sees, even though the banshee itself is effectively blind. Ghosts use specialized goggles that can see objects on every wavelength, just not the visible spectrum, as the visible spectrum bends around the ghost. Banshees are also equipped with similar sensors. Dark Templar can psionically sense everything around them, and Observers function the same way ghosts do. They simply see all other spectrums but the visible spectrum.

They have small gas vents on their wings that allow them to release pressured gas to propel them, like organic rockets. They flap their wings to release the gasses in exactly the right direction to make small adjustments to the position and to keep balance so they don't end up flying upside down.

On planets with atmosphere they use almost fully wing-powered flight, but they can still use the rocket function to stay on one position.

To increase the zerg ability to adapt fast, all organisms in the swarm have incorporated a retrovirus into their genome. While all cells critical to the organisms structure and vital function are immune to the retrovirus, the virus is accommodated and secreted in special glands in their mouth linings, claws, hydralisk spines and mutalisk spores. When a an other than zerg organism is attacked and killed by virtually any zerg creature, this retrovirus infects their still-living cells. While the majority of the viruses will simply destroy the cells they infect, a small amount of them will incorporate parts of that organisms DNA and RNA instead of its own DNA. This process is known as transduction. The creep absorbs these viruses and returns them to the hatchery, where they infect the larvae and can thereby alter its genome by creating reverse transcripts (known as complimentary DNA) of the messenger RNA in the cells. Because of the low rate of transduction, this process is slow, but after an entire ravaging of a planet, billions of fragments of foreign DNA will be able to be incorporated into future organisms of the swarm.

The Protoss took the shield technology development to new heights with the Guardian shield which can be generated by a Sentry. It protects all nearby units by slowing down enemy missiles. Really showing a passions for shields, Protoss engineers also developed a tactical force field which is also deployed by the Sentry through very small robotic cells. Those have enough energy to maintain a nearly impenetrable force field for 15 seconds. This energy is taken from the Sentry’s main battery prior to the launch of the force field cell.

To complement the Immortal modification, the Dark Templar caste operates another Dragoon-based combat walker development, the Stalker. They took the idea of a personal teleporter further to teleport the entire unit. However the use is limited to a short range.

An Observer must be fine tuned prior to its launch, as even small details like the density of the air – if there is any – play an important role in keeping the silent witness cloaked. With so much configuration needed, it is only logical to produce these units on the location.

Previously crippled Zealots serve as a driver for a Dragoon in which he got implemented. The implementation of the occupant was previously done in the Gateway. Recently the Protoss refined the Dragoon to muster the Immortal which is able withstand heavy enemy fire at the cost of air raid defense. This modification is done in the robotics facility. The improved shield of the Immortal tolerates insane amounts of damage. However, smaller projectiles are able to pass the additional defense. Since the number of Dragoons is limited and the schematics are lost, they act as last resort in the Protoss defense.

Warp Prisms are a delicate matter at these prisms offer mobile psi energy refractions. Similar to the Observer, a default unit would not be able to provide the necessary precision.

The Colossus is so tall that warping him in would raise some issues even for Protoss technology. The Colossus also needs additional parts assembled in the robotics bay. His walking mechanism must be calibrated for the ground consistence to optimize weight distribution to each leg. Walking a meadow on an inhabitable planet is not the same as walking over boulders of a small moon.