Working Title

Genre

Concept

Target age classification

Platform

Engine

Bathyal

Tactical Exploration, Roguelite

Lead a group of characters down through the alien layers of a chasm. Make tactical decisions to keep them sane and alive and unlock new paths, to finally uncover the secrets of the abyss.

Players age 12 and older.

PC

Unreal Engine 4 (3D)

PILLARS

1. Exploration - : Landscape, Creatures, Mechanics & Lore
2. Horror/Dread - : A gloomy & dark atmosphere

UNIQUE SELLING POINTS

• Selling the fantasy to explore the Unknown
• Unique visuals conveying excitement & horror
• Recognizable art style and design
• Gameplay mechanics found in board games
• Dark, Grim & Gritty

TARGET AUDIENCE

Our Audience enjoys:

• Turn-based tactics & board games
• Resource allocation & short-term planning
• Meaningful decisions
• Customizing characters & builds

Sam buys a game he heard his favourite Twitch-streamer talk about. Sam loves games about strange and unknown worlds and tactical challenges. Upon starting it, he sees the silhouettes of three people looking down into the darkness of an abyss. The music starts: a haunting, dark melody. He is intrigued and already feels the atmosphere of the game: gloomy and mysterious.

He sees a short cutscene explaining the background story: When did the chasms open? Why are people going down there? He starts to feel excited about exploring the chasm and uncovering its secrets himself.

The cutscene transitions into the game. There, Sam sees the characters who are waiting to start their journey into the depths. There is not much he can tweak in their equipment at this point so he decides to just go with the defaults and starts his adventure.

What he sees now is a large ledge on the side of the steep cliff walls. On there he finds his party. He notices that the background music is now slightly more unsettling: the real game begins. Sam notices alien-looking plants and ruins spread across the plateau. Some places catch his attention, among them a spherical, papery structure that is held by

thorny branches. When hovering the cursor over it, it starts glowing. He realizes there is some kind of game-event waiting for him and decides this will be the first thing to explore.

Sam now tries to see what else he can do. When holding the left mouse button he can turn the camera around the small plateau. He notices a sanity bar on the bottom of the screen. Realizing that his characters can apparently go mad, he becomes more careful before clicking away. He clicks on the sphere and Sam reads a description, telling him that it has a hole large enough for a human to enter and that it smells like cinnamon. Sam chooses the scientist and the adventurer to investigate the structure and he pays some sanity for them to climb in. 

One side of the sphere disappears and its insides become visible. A few words describe where the strong cinnamon scent is coming from: Hundreds of semi-translucent strings are dangling from the top. They are thick like fingers and the smell is so strong it’s sickening. There is something shiny further back. Now Sam can choose between three actions using different abilities: Wind through the strings quickly (acrobatics), cut a way through the strings (fighting), or carefully cut one of them for research and leave (no ability check).

He also notices that his scientist passed a plant life check upon entering, and he sees the bonus info that this is a carnivorous life form, which means that the strings are dangerous to the touch. Knowing that, he thinks that cutting down the strings is the safer option. The UI shows him that each decision requires him to roll some dice by spending sanity and that the more he spends, the more likely he is to succeed. He also sees that he can use items to help. Not having any of those, Sam thinks he could spend more sanity to be safe but decides against it, to not run out of sanity too fast. Unfortunately, both characters get entangled in the strings. They feel searing pain where the strings touch their skin and barely manage to struggle free, both suffering a wound. The spheres side reappears and he sees a speech bubble over the scientist’s head: “Never again!”. He is unable to enter the sphere for the rest of this run.

Learning that every action he takes could have severe consequences, Sam is determined to beat the hostile Bathyal by playing his cards right from now on. He can’t wait to see what lurks behind the next corner of this strange place.

Shadows move in the depths, hungry eyes and restless limbs. A sinister world of beauty and terror which swallows those foolish enough to approach it. Oh, the chasm is deep, filled with darkness and nightmares. Go there, if you must – but know that you might never return, my friend.

The game takes place inside a giant, multi-layered chasm. The chasm has swallowed the big cities of the world. Most people don’t know why this has happened, but afterwards, the world started to change: Toxic fumes leaked from the depths and changed the weather for worse. Swarms of strange insects crawled from the murkiness and infested the fields, the orchards and the animals of the people who lived away from the big cities, in villages or as nomads. Nowadays, many have become sick and barely have enough to eat.

Some people have climbed into the chasm in search for answers. They have brought unfamiliar relics from below, some in the language of the city dwellers, some alien and outlandish. They are scientists, treasure hunters, soldiers of fortune. Some want to gain knowledge about this world below, some want the gold they seem certain to find. Some come for the thrill, and some are desperate to end the curse the chasm has cast upon the land.

In time, they (and the player) will learn that the cities were not innocent as to their downfall. Warnings have been ignored, and the underworld has been exploited, thus causing a delicate balance to collapse. The player will gradually find out more about the exact events that led to the world as it is now. The chasm itself is filled with toxic air, which is why adventurers need to plan their trip thoroughly, as no-one can withstand the fumes forever if they want to stay sane and healthy.

The chasm has many layers, and going down feels like entering the maw of the world. There is a bottom, but few have seen it and rumor has it that this place is full of structures that resemble houses, though uncanny and not much like human dwellings. On their way down, the adventurers will see many ruins of the fallen cities, among the multifarious fauna and flora of the chasm. Most creatures here are dangerous, as are the plants, but with enough persistence and curiosity it’s possible to find a way down.

The layers of the chasm each have their distinct personality and style, because they symbolize different ecological biomes. The chasm’s ecosystem strives to be believable, yet alien. All creatures encountered and studied will be added to a bestiary that will prove helpful on future runs.

CHARACTERS

The player will have several different characters to lead on their journey. They come from different backgrounds and have different reasons to explore the depths, but ultimately, they all know that teaming up will improve their chances of coming back alive. There is Nazyr, an ageing professor of zoology from the Purple Sea, or Yama, a young tinkerer from the mountains. There is Zara, aristocrat from a fallen dynasty, or Kesirat who doesn’t talk much but knows how to wield a sabre. More will come and go, many will lose their life in the chasm. Who and why will always be different. The characters will wear masks as they descend, to avoid some of the toxic fumes.

NPCs

The world inside the chasm is pretty much devoid of human life. Apart from the odd adventurer here and there, the only other humans the player can encounter are very strange people, who have grown accustomed to the poisonous air. They aren’t exactly human anymore, but have been twisted and consumed by the chasm. Many have forgotten how to speak or have fungi growing from their bodies. Their skin may be green, and their eyes may see like cats’ in the darkness. The player is better off avoiding them, but the occasional encounter will occur.

Sanity & Time

The toxic atmosphere of each biome causes the characters to go mad. The longer they stay there the worse it gets and the more hostile the biome becomes. Since Bathyal is turn-based, different actions take different amounts of time and sanity units. The characters' sanity is the most important resource in our game.

Items & Knowledge

To better overcome challenges, characters can use item and knowledge resources. They are acquired through exploration and consumed on usage.

When our game starts, the player is given a team of three characters: an adventurer, a scientist and a treasure hunter. While traveling they will find other characters that are trapped in the chasm. If they free them and the run eventually ends, those new characters will be recruitable in the next runs. The player can now build their own team from the

default characters and those they saved. Each character has their own attributes, abilities and Items but can be customized as well in order to optimise the team and reach deeper levels. Some characters and abilities open up alternative paths, previously hardly traversable.

The chasm consists of many layers. Each layer contains multiple dioramas which are connected via passages. However, certain passages are blocked or hidden and require special key-characters or key-items, which the player has to find and unlock first. Unlocked paths can open up shortcuts between the layers for future runs or reward players with rare items. Every layer will have its own theme, colour palette, and

(maybe) its own sound. This helps keep the player engaged throughout the game. There are multiple branching ways down that lead through different biomes and dioramas. To reach the bottom of the chasm and to finish the game, the player needs to find the last key-character hidden in the fourth and most dangerous layer.

When entering a diorama players are greeted by a short introduction text. Afterwards they can interact with the diorama by turning the camera around and selecting places

they want to investigate. Sometimes these places are not immediately visible and players have to look around a little.

Before committing to the investigation of a point of interest, players get a short description of what they are facing and can decide to leave it be. If they still wanna investigate, they have to pay time and sanity for every following decision.

Most decisions require the players character to pass a check on one of their abilities. They may use their resources to increase their chance of success or even compensate for bad luck. This would be the event-structure of the diorama on the gif above:

When moving from one diorama to the next, players are confronted by a random event. It will occur occasionally and doesn't have deep structures of decisions, like in a normal

diorama. the player still has to make short decision that will reward or punish their party.

During a Run

• Characters can improve through loot and
  experience but also regress through wounds or
  insanity.
• The deeper the party descends, the fiercer the
  environment will become.

Across Runs

• New characters, abilities and items can be
  unlocked that enable new tactics and routes for
  future runs.
• Knowledge of the world makes future runs
  more likely to succeed.

We try to create our own Style by mixing physical based rendering and visible brushstrokes. Our goal is to achieve a rough painterly look without using any post process effects. We want to maintain a realistic behaviour of light to simulate the increase of darkness as you move deeper into the chasm. We also want to have realistic light interaction with surfaces so that our assets fit perfectly into the given scenery, therefore we use a PBR rendering Pipeline. To avoid much effort by hand painting each Asset, we work on a procedural workflow to achieve the painterly look.

Sound effects underline every player interaction, like button clicks or item selection as well as different consequences of player decisions.

NEEDED GAME SYSTEMS

Character

Stat & Ability Systems
Ressource/Inventory System

Event

Decision Tree
Check System
Save System

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