Temporal Horizons (Time Travel & Time Paradoxes)

Temporal Horizons is a time-travel mod that lets you explore the same Minecraft world across several different eras.
Terrain, oceans, vegetation, structures, entities, the sky, and many other environmental features change depending on the selected time period. Some changes made by the player can also propagate through time, creating a connected timeline between eras.

Added Items:
Time Jumper Device
Opens the era selection menu and allows you to travel through time.

Fast Return Device
Quickly brings you back to the Present from any other era.

Temporal Instability Detector
Allows you to see the exact value fo your current temporal instability.

Time Paradoxes

Time Paradoxes are caused by interfering with your own past.
When you enter in the era Past 10, a visible replay of your past self appears, doing the exact things you did before the first time travel.
Approaching the replay, attacking it, blocking its path or changing events around it creates a paradox and increases Temporal Instability. The closer and more serious the interference is, the stronger the effects become and eventually you may cause a temporal collapse.
Other players can see your replay, but only interacting with your own past self can create dangerous paradoxes or trigger a Temporal Collapse.

Available Eras:
Past 3 Billion Years
Past 1 Billion Years
Past 400 Thousand Years
Past 10 Years (World as it is generated)
Present (Overworld)
Future 2 Thousand Years
Future 400 Thousand Years
Future 3 Billion Years
Future 6 Billion Years

Each era presents a unique version of the world, ranging from ancient oceans and frozen landscapes to ruined civilizations and a planet transformed by the distant future.

Do not keep your render and simulation distance too high or it will be very slow to load era’s dimensions (Recommended render distance: 12 chunks, simulation distance: 10 chunks).
To avoid crashes while switching eras, it is recommended to return to the Present before traveling to another era.
Do not travel too fast between eras when loading them for the first time, wait until all chunks within your render distance are fully loaded before changing era again.

Player-built structures created in Past 3 Billion Years, Past 1 Billion Years, and Past 400 Thousand Years are intentionally not preserved in later eras. This is a gameplay design choice, not a bug.

Crafting Recipes:

This is an early release, so bugs and unexpected behavior may occur.

You are free to include this mod in any public or private modpack.
You may also create and publish ports of this mod for newer Minecraft versions. No additional permission is required.
Please provide credit to the original project whenever possible.

Found a bug or have a suggestion? Feel free to leave a comment on the project page. Feedback is always appreciated.

Original concept by: Sophka (Published with their permission)

Requirements

• Fabric Loader 0.19.3 or newer
• Fabric API 0.107.0+1.21.1 or newer (for Minecraft 1.21.1)
• Java 21