As surmised. . .

You awaken from your dream as the ground shakes. A picture falls from the wall, its glass shattering on your floor. There is a low rumble outside, the threat of an oncoming storm. You push open your window, and the scene unfolds. Depending on your personality test, your house can be in different states of luxury, but the general view is always the same. Your bedroom is high, allowing for an all encompassing look of the city. The skies are bruised, dark and reddish, flickering with lightning. Pillars of smoke dot the metropolis, and the buildings have a strange, unreal feel to them. They seem to be curved and stretched, almost organic. 

People move over top the roofs, and weave between the buildings in the endless, intricate crosshatch pattern of roads and streets. They move in a hurried, dogged, panicked way. As if at any moment they are ready to run. 

It is the last day on earth, and things are a little strange. Things are wrong. People are going mad, inanimate objects (like statues, trees, stuffed animals) are coming to life, and their is an eternal thunder storm overhead. Wars are cropping up in all cities, and the people within cities are turning against one another. It is chaos and madness. You can hear rioters in the distance, you watch lamposts uproot themselves and walk amongst the people. You descend into the streets, and the player is given control. A friend, free of the madness but looking a little tired, sees and greets you. They give you your objective, and off you go. 

It's not so much later that you die. If you were particularly compassionate, you die saving a little girl or a kitten or something. But if you're more aggressive, you die in the midst of a barfight, or in the middle of a riot. 

And no matter whether or not you're good or evil, you land in hell. What your hell looks like varies on your personality test. The compassionate would see innocent people writhing in pain, the aggressive would be constantly dogged by enemies, etc. As you make your way though the level, trying to find your way out, you begin to hear the voice, coaxing you deeper in, and you eventually find a maiden chained to a pillar that reaches from the ground to an unseeable roof, the cavern reaches so high. 

The story goes, she's god, and she's the reason why you're in hell if you're good, and you're redeemer if you're not so much. She was bound here by her sister, who used to rule hell, before coming up to heaven, throwing her down, and chaining her here. That's why things are so f'ed up in the living world. So, she gives you an option. She'll give you a way out of hell if you play the role of her vessel, go up to heaven, and usurp her sister. What's more, she'll make you a god.

So, hey, why not.

So she takes over your body, and with her power you're able to unlock the doors of your hell, into the next one. She tells you that there are multiple beings (her servants) that are locked within each chamber, their own personal hell, and that it will be necessary to free them to take on her sister. So, using her power to unlock the door of one of three rooms, you encounter in their own hell the minotaur, siren, wendigo, etc. And with them, and the goddess, you take on a boss that represents what keeps them in their hell. For the siren it might be a pirate she loved that betrayed her, and had her raped by the crew. The minotaur's could be his princess mother who had him locked away, and all the people who were sent into his labyrinth to feed and try to kill him. Etc. 

And as you reach the last chamber, with them you take on a gatekeeper boss. 

Once you defeat him, you're back into the land of the living, and things have gotten even worse. Now, you must recruit an army to fight against those that are lead by people who claim to be possessed by minor gods of heaven, and that you're in fact possessed by the usurper of heaven, a goddess of death. 

On top of that, you also have to take down the pillars that safeguard the entrance to heaven, which are usually guarded by an enemy army. One was in hell, but by releasing the goddess you destroyed it. Another could be on land. Another could be in the middle of the sea. By destroying these three you can enter heaven, where the last pillar remains, occupied by the other sister goddess. By destroying her, and the pillar, you can restore the usurped one.

To elaborate more on the ocean one, it could be that with the siren/krakken/colossal squid/anthropomorphic dolphin alley you have you could breathe underwater, to find the entrance of the tower pillar. While you're underwater, there could be a city, with people who are suffering their own problems. The blood of their primary food, fish, has turned to a toxic taint, and they are all slowly starving to death. Some resort to cannibalism, others have gone to the aboveland. And in this decaying metropolis there is a royal family, who refuses to leave. And with them there is a princess, whom is attracted inexplicably to your character, to your power and purpose, and your freedom. She is the one who gives you the key to break the tower's seal and reach the inner pillar within. 

She'll follow you into the tower, and she will be confronted with an ancestor god. The first king of her kingdom, who enshrined himself here as the protector of the pillar thousands of years ago. He will begin to verbally abuse her, and will eventually suck her into the pillar, where they transform to become the boss. If you don't attack her, and attack only the guardian, she will fall form the pillar and you will have the chance to recruit her.

The tower of land will be in a mountainous, icy terrain, surrounded on all side by dense wood. There are small, nomadic tribes that the player can take shelter with, and learn from them of the wendigo, a creature who was once a man, but devoured human flesh. As you work your way closer to the tower, you're eventually beset by packs of them. Huge, gaunt wolves nearly the size of men. You take shelter in a cave, and at night a man arrives. He is tall, and gaunt, and spells undeniably of blood. He is charming and psychotic, and states blatantly that he is a wendigo, but rather than devour you, he'd rather strike a deal. He doesn't much enjoy the woods and the company. The longer you're here, he says, the more you begin to lose it. Soon, you lose your ability to shift back into your human form at all. In return, he'll break the seal for the tower of land. What he doesn't tell you is that he killed and ate half of the pack leader's pups and that he is, in fact, being hunted and he needs some protection. 

You accompany him to the tower, being dogged all the while by the cursed wolves, and break the seal, and there is a man frozen in ice. He looks like the natives, but he is exceedingly beautiful. As you draw closer, his eyes open and the ice around him fractures, eventually shattering. He begins to transform as he steps down from the pillar, into the largest, most vicious Wendigo you've yet to see. He was the very first to turn on his kin, the very first of the cursed ones. One of the cursed wolves attacks him and is immediately devoured, with his head sprouting from the first wendigo's neck. The others cower and submit, and together they turn on you.

As the fight draws on, he will eventually devour one more wendigo to become a cerebus like creature, and spew ice.