UE5.4 New feature: Cloners
For example, by using the Cloners plugin, you can make anything fall from the sky (Stone, Snow, Balloon, Rain, etc.).
https://dev.epicgames.com/community/learning/tutorials/Ybnx/unreal-engine-ue5-4-new-feature-cloners-and-effector-review-example-let-s-make-it-rain-particles-from-the-sky-subtitle