I'm trying to use "origins:in_thunderstorm" to make the character vulnerable to thunderstorm fear, making damage dealt less while the player is outdoors during a thunderstorm, and adding "origins:shaking" for aesthetic completeness.

But I have repeatedly encountered the problem of not loading power, the log says: Unknown registry key: origins:in_thunderstorm

Can you send your entire output log? I'm going to need more information to work with 🤔

latest.log

The in_thunderstorm entity condition type was introduced in Origins 1.11.0, which is for Minecraft 1.20.2. You can achieve a similar thing by using the origins:predicate entity condition type with a predicate that uses the minecraft:weather_check type