📦 Description
This (unofficial) really small, simple and lightweight datapack automatically replaces vanilla Minecraft horses with SWEM (Star Worm Equestrian) horses for any world or server — completely in the background and without any need for command blocks.

It runs every tick and uses an optimized execute command to detect vanilla horses and summon their SWEM equivalent at the same position.

🧠 Designed for modded servers or singleplayer worlds using the Star Worm Equestrian Mod (SWEM), where you want to fully transition from vanilla to SWEM's horses.

💡 Honestly — this is something the original mod should have done from the beginning. Or at the very least offered as a simple config toggle (true/false). But for some unknown reason, it wasn’t included. Why? I don't know... So this datapack steps in to do exactly what SWEM overlooked: a smooth, automatic replacement of vanilla horses with SWEM horses.

No commands... No setup...
Just horses that work the way you'd expect in a SWEM-based world.

How it works

🛠️ Compatibility

✅ Tested with Minecraft 1.20.1 (requires SWEM mod).
⚠️ Should be compatible with 1.16.5 & 1.18.2 (same datapack structure - but not guaranteed & not tested).

If you encounter any issues or want to suggest improvements — just let me know (kindly, please!) and leave a comment!

🔧 How to Install

Download the .zip file.
Drop it into your world's /datapacks/ folder.
Start your world or server.
Run /reload (if needed).
Done!

✨ Feel free to use this datapack in your own world, server, modpack
Just enjoy it and ride off into the blocky sunset. 🐎🌅

Also on Modrinth
https://modrinth.com/datapack/convert-vanilla-horses-to-swem-horses-datapack

PS.

You can do it also by using Repeating Command Block

> Command used <

execute as @e[type=horse] at @s store success entity @s[y=-64,dy=320] Pos[1] double -2112 run summon swem:swem_horse

Thx for idea and base command to GalSergey from Reddit.com
https://www.reddit.com/r/MinecraftCommands/comments/12j48um/comment/jx87o3i/

Convert Vanilla Horses to SWEM (Star Worm Equestrian) Horses

Star Worm Equestrian (Upgrading Horses)