A custom animation notify that can spawn meshes within animations, play animations on them, and override their materials. These meshes can be viewed and adjusted from inside the animation editor, with a realtime preview.
https://dev.epicgames.com/community/learning/tutorials/oWD6/unreal-engine-spawning-actors-in-animations
Very interesting. If you put in on FAB i’m gonna buy it 
What happens to the spawn actor if it’s on a looped animation or if an animation get interrupted(switches to something else) before the ending of the anim notify state?
If the animation loops, the notify will be re-triggered and spawn another actor. When an animation is interrupted, Unreal automatically triggers the “NotifyEnd” event of any ongoing notify states to ensure they get cleaned up properly, so the actor will be destroyed if the animation ends early.