Soul stones are commonly located with the occult or magic, such as Cultists and Wizards. They can be used to build up an army of loyal servants.
Shades and constructs are slaved to their masters will. They must follow the orders of their master at any cost. They are capable of grasping intent, unlike synthetic beings. Shades as well as any constructs are EVA capable and can maneuver in space without outside aid. Should they die, they leave behind ectoplasma which can be used to make ghost-burgers. Constructs created by cultists automatically become cultists themselves, allowing them to identify their team mates, and even count for the escape objective. Clever crewmen who steal soulstones and shells can create their own constructs to fight the cult.
Some constructs have special abilities, which can be used similar to mime-, changeling- and wizard-abilities via the tabs on the right side of the SS13 interface. All constructs are immune to being stunned, but similarly their attacks have no stun chance like regular attacks.
Soulstones are used to house souls. They can be used to release said souls, into the form of a shade. A soulstone can be used on a dead or living human in critical condition (providing the soul is still inside the body) to load his soul into said stone. From here, the soul can only speak, but the master can momentarily release the soul and it becomes a shade, or inserted into a construct-shell to be made into one of the various kinds of constructs.
Shades are fragile, but being recaptured into their soulstone heals them. All a shade can do is slowly drain life, remove clothes (and handcuffs) and spin chairs.
Fun fact: humans can pull shades (no, not like that, you sick fuck).
The artificer is even more fragile than a shade. It can construct cult-floors, walls and reinforced walls, as well as take apart the station, but its main purpose is to provide the materials to construct additional constructs. It can create new soul stones or shells after a certain time. In addition to that, it can heal itself or other constructs by “attacking” them.
The wraith is a tiny bit more fragile than a human, but has a strong melee attack. It can, similar to a wizards Ethereal Jaunt, become invisible and travel through closed doors and even walls by using it's phase shift ability. This construct is the bane of the AI, as the stationary AI core is defenseless against them.
Juggernauts are strong, slow and have lots of health. They can destroy any wall by simply punching it and do more damage than Wraiths. They cannot be pushed or grabbed and even have a force-wall ability similar to the wizard spell. Additionally, Juggernauts are immune to any weapon of force 10 or below, such as fire extinguishers, harm batons, and large air tanks.
Harvesters will only appear after Nar-Sie has risen, and they have one goal: To bring you screaming and kicking back to Nar-Nar. Their attacks do not do much damage but they will take off a limb. Once you have no limbs (or no will to crawl away), they will drag you back to Nar-Sie to become a harvester yourself.
Harvesters have two abilities, one is an area convert that turns a small area of effect around itself into cult material, and the other one is a shield to block humans from escaping their grasp. Finally, they can go through cult walls, so they will use their area convert to pass through obstacles to get to you.
Pleasing Nar-Sie will make her grant you with an evolved shell, allowing you to absolutely dumpster those meatbags. There's two ways to Please Nar-Nar: