I've posted this before, but I felt bad about using AI for translation, but now I've translated it manually and with small help from Google Translate. Languages ​​in general are not my strong skill.

I've always loved the universe and its "infinity" and unknown. As a result, I've watched a lot of series (e.g. StarGate, Star-Trek, Battlestar Galactica), movies (Project Hail Mary) and played a few games (Half-Life, a little Warhammer 40k). But lately I've become interested in traveling between other realities/dimensions, the best comparison I have is Minecraft (Overworld, Nether, End) and Fortnite (rifts). So I decided to combine them.

 

The multiverse will consist of an infinite number of realities. Reality will not be just one planet (as it seems in most media that uses the Multiverse), but galaxies, sometimes universes.

• There will be no alternative realities of the typ, find an evil version of yourself (e.g. Marvel and DC)
• There will be no change (dilation) of time here - time passes the same in all realities (1 minute here is 1 minute there)
• Physics, chemistry, biology will operate on similar principles but with unique variations, something like Project Hail Mary (Rocky)
• I would also like to have magic but I have not yet decided exactly how it will work

Realities will be separated by a wall. This wall will not be able to be detected. What will be detectable will be weaker/thinner places in the wall where cracks/rifts will form. Natural rifts will randomly open and close.

The walls are constantly moving, stretching and compressing (thus also the weaker/thinner places move) like tectonic plates, or what is happening in reality (e.g. research and an attempt to open an artificial rift) something like an ozone hole. Around thinner walls and especially after the crack/rift opens, irregularities will begin to appear (e.g. gravitational anomalies, temperature changes).

Most of the time, people will travel on foot or in small vehicles (Jeep, small tank). The bigger the thing, the bigger the rift/portal needed, the more energy is needed to open it.

Portals will be able to open rifts/cracks even through thicker walls of reality.

 

I have a few more ideas, but for now I just want to work with this one.

Have a nice and pleasant day.

Before anyone asks, I don't know English very well, this text was translated using Translator and AI. If it's a big problem, I will delete it personally. If it's okay, thank you for your understanding and have a nice day.

I’m working on a multiverse worldbuilding system and I’m specifically looking for logic-focused critique. Please don’t hold back (but pleas no hate comments) — I want to find structural problems before I build stories in it.

This is not a story yet (no characters, no plot), only the underlying rules of the setting.

Also, this is my personal interpretation of alternative realities, loosely inspired by multiverse concepts in franchises like Marvel (no, I don't like the new Marvel movies, but the Multiverse fascinates me and I want to expand on the idea here) and the unknown-reality themes in Half-Life, but with original rules. If I copied someone by mistake, please don't sue me. 😢

 WHAT I’M LOOKING FOR

• where does this break logically?
• what assumptions don’t hold up?
• what would you simplify or remove?
• what parts feel like “handwaving”?
• what would you redesign?
• and more

CORE IDEA

The multiverse consists of infinite separate realities. Each reality is a full universe with its own galaxies, stars, planets, civilizations, and histories.

Physics and chemistry are almost consistent across realities, but biology, environments, and materials can vary significantly.

This allows cross-reality interaction while still enabling alien ecosystems and strange worlds.

 

WALLS BETWEEN REALITIES

Every reality is separated by an invisible “wall of reality”. These walls cannot be observed, touched, or directly detected.

They act as structural boundaries between universes.

The wall determines:

• how many rifts can exist at once
• how large they can become
• how stable inter-reality connections are

Wall thickness does NOT mean immunity. It only changes resistance to breaches.

Walls behave like a hybrid of:

• tectonic plate pressure systems
• elastic membranes under stress

They shift over time and can create weak zones.

 

NATURAL RIFTS (BREACHES)

Natural rifts are spontaneous, unstable connections between realities.

They behave like:

• volcanic eruptions between universes
• ozone holes in a protective layer

They are:

• rare
• unstable
• unpredictable

Important constraints:

• they do NOT form in vacuum
• they require dense matter/energy environments (planets, atmospheres, etc.)

A rift does NOT guarantee safety — it may lead anywhere, including dead or hostile realities.

 

INTER-REALITY TRAVEL

Advanced civilizations can create stable portals using technology or magic.

These enable trade, exploration, warfare, and diplomacy between realities.

Portable devices can also forcibly open rifts in weakened areas, but this is:

• extremely dangerous
• energy intensive
• highly unstable

 

LIFECYCLE OF REALITIES

Realities are not static — they evolve and decay.

Types:

• young realities (very thick walls, isolated)
• stable realities
• old realities (weakened walls)
• dead realities (“Souls” – abandoned/stagnating universes where civilizations may have disappeared)
• destroyed realities (collapsed or erased systems)

Destroyed realities can result from multiple causes:

• Void-related collapse
• actions of advanced civilizations
• cosmological decay or long-term entropy effects
• combinations of the above

Destroyed realities

These are any universes that have ended or collapsed, regardless of the cause. A reality can be destroyed by:

• other advanced civilizations
• natural cosmological decay or collapse
• long-term entropy or internal failure

So this is a broad outcome category — basically “everything that no longer exists as a functioning reality

 

VOID (CORE PROBLEM ELEMENT)

The Void is not a being, intelligence, or empire.

It is a phenomenon: a state of non-being incompatible with structured reality.

It is not known:

• what it is
• why it exists
• why it spreads

It does not act with intent, but it erases and destabilizes reality itself.

It affects:

• matter
• ecosystems
• atmospheres
• fundamental structure of reality

 

VOID MANIFESTATIONS

The Void manifests through distorted constructs formed from absorbed matter of consumed realities.

Examples (not fixed taxonomy):

• humanoid-like corrupted units
• large siege structures
• aerial assault forms
• environmental corruption effects (fog, distortion, spatial anomalies)

These are physically destructible, but not biologically alive.

 SPREAD MECHANICS (VOID)

The Void spreads along paths of least resistance:

• thinner walls → faster spread
• thicker walls → slower spread

However, it can unpredictably deviate and breach even extremely strong barriers.

No reality is fully safe.

Void Line (specific phenomenon)

The Void Line is something more specific.

It is not just a list of dead universes, but a continuous trace / front of Void expansion across the multiverse.

It represents:

• realities currently being consumed or rewritten by the Void
• partially corrupted or collapsing worlds
• the “path” of Void progression over time

So unlike general destroyed realities, the Void Line is causal and directional — it shows the movement of one specific force.