Description
Ultimate Decades Assistant is an unofficial companion mod for Morbid’s Ultimate Decades Challenge.
It is designed to make the challenge easier to manage directly in The Sims 4 by tracking historical time, Sim ages, required rolls, and historical events - while leaving the actual decisions, dice rolls, and storytelling in the player’s hands.
The challenge itself uses a custom historical timeline instead of normal Sims aging, including the system of 4 Sim days = 1 historical year.
Features
Historical Calendar
Ultimate Decades Assistant brings the challenge's historical timeline directly into the game.
- 4 Sim days = 1 historical year
- 1 Sim day = 3 historical months
- Historical time progresses automatically as you play.
- The mod notifies you when a new historical year begins.
Historical Sim Ages
The mod tracks historical age separately from The Sims 4's normal aging system.
- Sims can have their own individual historical age.
- Historical ages progress automatically with the calendar.
- Newborn Sims receive a historical age automatically.
- Existing Sims can be configured manually using years and months.
- An already assigned historical age can be changed whenever needed.
- Sims in side households can retain their assigned historical ages without needing to be actively played.
Household Information
Quickly check the information relevant to the household you are currently playing, including:
- the current historical date;
- historical ages of household members.
Roll Reminders
Ultimate Decades Assistant keeps track of situations in which Morbid's challenge requires the player to make a roll.
Depending on the currently supported rules and historical period, reminders can include:
- Labor and birth rolls;
- Survival/death rolls;
- End of Life rolls;
- Historical event rolls.
Roll reminders are tied to the appropriate historical life stage.
The mod tells you when a roll is required and which roll to make, but the actual dice roll and its outcome remain entirely in the player's hands.
Historical Events
Historical events are connected directly to the historical calendar and can trigger automatically when the relevant year is reached.
Depending on the event, notifications may provide:
- historical event information;
- temporary challenge restrictions;
- required actions;
- required dice rolls.
Support for additional historical periods will be added progressively as the mod expands.
Automatic Save Data
Historical calendar and Sim age data are saved automatically, allowing your timeline to continue between game sessions.
Currently Supported Historical Content
The mod is being expanded chronologically through Morbid's Ultimate Decades Challenge.
Currently supported:
1300s - The Middle Ages
- Historical age and life-stage system;
- Labor and birth roll reminders;
- Life-stage survival/death rolls reminders;
- End of Life reminders;
- 14th-century historical events and their corresponding notifications, instructions, and roll reminders.
Future updates will continue expanding the mod through later historical periods of the challenge.
Updates
v0.2
- Added the ability to change the historical age of Sims who already have an assigned age.
- Added additional 14th-century historical events, including their corresponding notifications, instructions, and required roll reminders.
v0.1.2
- Fixed the new historical year notification so it only lists Sims from the active household. Sims in side households can still keep their assigned historical ages without appearing in this notification.
- Corrected roll reminders so each roll is triggered at the appropriate historical life stage.
v0.1.1
- Replaced S4CL with Lot 51 Core Library, while keeping the previous functionality unchanged.
- Added a roll reminder for labor and birth.
v0.1 - Initial Release
- Added the historical calendar and automatic time progression.
- Added historical Sim ages.
- Added household historical information.
- Added survival/death and End of Life roll reminders.
- Added automatic save data.
- Introduced the historical event system with The Great Famine (1315–1317).
Guide
For setup instructions and a more detailed explanation of how to use Ultimate Decades Assistant in-game, you can read the full guide on Patreon:
Getting Started with Ultimate Decades Assistant
Languages
Currently supported:
- English
- Russian
- Spanish
Requirements
- Lot 51 Core Library
- XML Injector Script
Make sure both Custom Content and Mods and Script Mods Allowed are enabled in the game settings.
Installation
- Download the mod.
- Extract the archive.
- Place the mod files in:
Documents\Electronic Arts\The Sims 4\Mods - Make sure the required dependencies are installed.
- Start or restart The Sims 4.
About the Challenge
Ultimate Decades Assistant is an unofficial companion mod created for Morbid's Ultimate Decades Challenge and is not the original challenge itself. All credit for the challenge and its rules goes to its original creator(s).
You can find the original challenge and rules here: [LINK]
This project is not affiliated with or endorsed by Electronic Arts, Maxis, or The Sims.
Credits
Ultimate Decades Assistant - Created by Exio
Unofficial companion mod for Morbid’s Ultimate Decades Challenge.
Original Decades Challenge concept by ZombieCleo.






