The Three Realms
The three realms were formed after Nediam, a deity-like being accidentally absorbed a planet while trying to divide her personal time. It caused her soul and lifeforce to be bound to the inhabitants, but required a circular flow to keep her alive. To stabilize her condition, she divided what was now her inner world into three different realms, through which her soul energy circulates via a rebirth cycle of the inhabitants. Also known as the 'soul cycle'.
The Mind Realm
The mind realm is normally seen as being in between the life realm and the soul realm, functioning as the passageway to rebirth. After souls are purified in the soul realm, they gain a new consciousness in the mind realm and are sent to the life realm where they enter newborn entities, giving them a soul. Inhabitants of the life realm can communicate with the mind realm through meditation, though it is a rare art.
The three Watchers that guard this realm maintain its existence and serve as guides for souls that pass through. The mind realm's functions are centered on the island of Vaellus, where the Watchers hold home and where the souls pass on to the life realm.
Souls are visible and tangible floating blue/purple flames in this realm. The Watchers and Wardens herd them to guide them to their next passage. Should somebody die in this realm, their souls either go directly back to the soul realm or slip through the life realm, where they can sometimes be seen as ghosts.
The inhabitants of this realm resemble Okotans, but mask powers and elemental abilities do not exist. The villagers are divided into element themed groups, a remnant from the once existed planet. These people live a normal life, sometimes helping the Wardens with herding souls. Without their knowledge, their presence is what gives a soul its new consciousness. The bypassing soul copies their foundation for thought, forming a base for new consciousness once it becomes new life in the life realm.
-The Island of Vaellus: An island that serves as the home for the Watchers. The mind realm's functions are centered here, where the souls pass between realms. The villagers have formed three tribes. One on the coast, on in the mountain and one atop the mountain.
The Soul Realm
A void with floating islands that's surrounded by what looks like space and stars. The place where souls heal. Souls of the dead enter this realm all around via miniscule portals and they sink lower in the void based on the weight of their sins, sorrows and regrets they had when they died.
This realm has only one Watcher who travels to the borders of this void and guides souls towards its center, where a stream-like gateway sends them to the mind realm. There also two Soul Wardens who aid the healing of the souls at the center of the void.
-The Rift: The gateway at the center of the void that leads to the mind realm.
The Life Realm
The material realm where life exists normally. Resembles the G1 Bionicle universe and contains a lot of its properties, including elemental powers, kanohi, kanoka and rhotuka.
Should unpurified souls somehow return to the life realm or never leave in the first place, they can potentially return to their original body, becoming an undead. Alternatively they might just linger around or find an alternative host.
After the events of Warden's Diary this world became flooded with unpurified souls, bringing back dead, bringing forth mutations as well as power hungry entities. This event became known as the Cataclysm. The society is now collapsed and survivors protect themselves within 'sanctums', small communities within fortified and old community buildings. The Toa have become old legends, and great kanohi masks have become rare after the great mask forge sunk. Masks and kanoka discs are now valuable items.
Story focuses on a region called Maanos, which has elemental regions similar to Mata Nui and within them cities similar to Metru Nui.
-Sanctum of The Divided: A sanctum in Ta-Maanos lead by a strange group of beings calling themselves 'The Divided'. The sanctum is one of the safest, but many refuse to come due to The Divided members' dysfunctionality, unknown background and a certain fear-inducing individual.
-Sunken Forge: Located next to the Sanctum of The Divided, this forge sunk under water soon after the Cataclysm. Dangerous marine life took over and the forge is now only accessible to amphibians or kanohi Kaukau users, and only if they can fend off the predators. Presumably kanoka and some kanohi can be found there if one is lucky enough to survive the dive.
-Vis-Koro: The 'Spider Town'. Neighbouring Ta-Maanos is Le-Maanos, which after the Cataclysm became infested with Visorak. Generally uninhabitable, Vis-Koro is still the shortest route to Ga-Maanos and can be navigated with the help of a Hordika, though few have maintained sanity.
-Keep of the Leech: A fortress at the edge Ta-Maanos ruled by a malicious being who became very powerful after the Cataclysm via his Mask of Scavenging. Earned its name by the reputation of its ruler.
Each realm has its own Watcher(s) that manage(s) its existence. They are powerful beings that house the core being of their respective realms in their powers. They do not age, but aren't immortal either, but should a Watcher die, the realm will lose control of the aspect that the Watcher maintained. If the realm has only one Watcher, the whole realm would collapse in the same situation, unless Nediam creates a replacement.
Watchers of the Mind
Ialona, Watcher of the Sea
A massive serpent dragon that roams the oceans of the Mind Realm to bring souls to Vaellus, the point of convergence. Lays eggs to create wardens. Mother of Monarth and Gail. Wardens created by her are amphibious. Represents the emotional part of the mind.
Sophra, Watcher of the Sky
A massive bird-like creature that roams the skies of the Mind Realm to bring souls to Vaellus, the point of convergence. Creator of Taival. Wardens of his creation are capable of flight. Represents the freedom and order of the mind.
Koorishuan, Watcher of the Earth
The creepiest and most twisted of the Watchers, though generally he is not evil. A massive turtle/crocodile looking creature. His body consists of rotting flesh, fungus, rotting plant material, moss, roots, dirt and other materials that are bound to earth. His face is rotten to the shape of a skull and has many pairs of eyes. He is rooted to the ground, unmoving and feeding on the souls in the environment through plants in a symbiotic manner. Also eats souls directly when wardens bring them to him. Represents the more undeterminable aspects of mind, aswell as death within the mind realm. His stomach is the gateway to the life realm.
The earth Watcher creates wardens by extracting them from his body by various means. Obcasus developed in a transparent cocoon that sprouted on his back/shell. Matteo was an illness the Watcher had and concentrated into a being that simply walked out of his mouth. Wardens of his creation are often deformed in one way or another, but can hold interesting abilities.
As both mind and soul realms are governed by at least one Watcher, each realm can potentially have Wardens. A Watcher may create a Warden anytime to ease their responsibilities, but in doing so give one of their own abilities to the Warden. The Watcher loses the ability until the Warden dies or merges with the Watcher again. The more Wardens a Watcher creates, the weaker the Watcher becomes.
The Wardens are essentially demigods, each holding one of their creator's powers and loyalty to the Watchers and their given task. They consider themselves children of the Watchers and give no thought of rebellion, even if their personalities can come from all ends.
The Mind Wardens
The Wardens of the mind realm all have received a power related to the mind. Some of these abilities are only usable in the dreamscape, which is a realm that represents the mind of its host. By accessing the dreamscape, the wardens can tend to psychological issues of the people they protect. Maintaining sanity, removing nightmares, repairing memories and so forth.
Known Mind Wardens:
-Monarth, the Dream Warden
-Gail, the Memory Warden
-Obcasus, the Death Warden
-Taival, the Sanity Warden
-Matteo, the Plague Warden
The Soul Wardens
The Wardens of the soul realm are tasked to purify souls of the dead, so that the soul energy can be reused for new life. These Wardens handle the souls' sorrows, regrets and other negative aspects they might have carried to the afterlife. They can all fly within the soul realm.
Known Soul Wardens:
-Viara, the Sorrow Warden
-Syvon, the Acperience Warden
The Life Wardens
The life realm doesn't have Watchers, instead it was once protected by weaker entitities known as Life Wardens, each of whom represented and mastered the essence of a single element, upholding nature's diversity. Due to life realm's nature, they were bound to age. Before passing on they created a process of 'pledging', which grants a worthy being elemental powers, making them a Toa, or something equivalent, tasked with protecting the realm. The process became a mystery after the last of the Toa vanished.