Cassiopeia Papyrus Extender
🟡 Updated this year⚠️ Install Order · 3 steps
Install in this order, then this mod last — most mods fail to load without their framework and dependencies in place.
Preview
🔍 Analysis
- 👍 0.6% endorsement rate
- ✅ Updated 10 days after the latest game patch — actively maintained
- 🏆 #5 of 44 Utilities mods in this game by downloads
📋 About This Mod
About this mod:
SFSE plugin that expands the capabilities of Papyrus by registering new native functions callable from any mod and script.
In other words, Cassiopeia is a tool for modders to develop scripted mods in ways that weren't possible for Starfield before and to write scripts more conveniently.
The complete function list can be seen here (Google Drive document) but it is also included in the mod files.
Event list and event registration are here.
Currently ~430 new native functions and ~60 native events are implemented.
Notes for mod authors: always make sure to test your scripted mod with New Game + (SetStage 24EF9C 2000) when you edit base forms with Cassiopeia because the vanilla game reset manager code is picky.
Requirements:
Cassiopeia Papyrus Extender is an SFSE plugin that expands Papyrus scripting capabilities for Starfield modders. With 1,977 endorsements and 327,077 downloads, it's a widely used utility for creating more complex mods. Last updated June 2026, it remains actively maintained.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Huge community trust — 1,977 endorsements and 327k downloads show it's a staple for modders.
- Actively updated (June 2026) so it stays compatible with current Starfield patches.
- Essential for anyone wanting to push Papyrus beyond vanilla limits — a must-have for serious mod authors.
⚠️ Cons
- Requires SFSE, which adds an extra dependency and setup step for users.
- As a utility, it's useless for players who don't mod — it's purely for mod creators.
For Starfield mod authors who want to write more advanced scripts and need extra Papyrus functions. Also for players who install mods that depend on this plugin — you'll need it for those to work. Skip if you're a pure player who never touches mods.
💡 Beginner Tips
- Make sure you have SFSE installed and launch the game through its loader, not the default exe, or the plugin won't activate.
- Check the mod's forum posts or Discord for a full list of added functions — the Nexus description is bare-bones.
- If you're a mod user, install this via your mod manager and ensure it's updated alongside SFSE to avoid crashes.
📊 Mod Details
- Game
- Starfield Mods
- Author
- LarannKiar
- Version
- 9.4
- Downloads
- 327,077
- Endorsements
- 1,977
- Category
- Utilities
- Created
- 8/10/2024
- Updated
- 6/21/2026
🧩 Commonly Used Together
Users add these mods to the same collections — a real compatibility signal, not an AI guess.
🔧 How to Install Starfield Mods
Download from Nexus.
📖 Full step-by-step install guide for Starfield →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for Starfield commands, item IDs, and more.
Keep browsing — more Starfield mods await