This Unreal Engine 5.3 Gameplay Ability System video is about creating an exploding FireBall Gameplay Ability that applies multiple stacks of the Burning Effect.
We start by fixing a few issues, and then create the FireBall Niagara System. Next we create the FireBall Actor and setup it’s movement, collision, and various ways it will call Explode which spawns the FireBall Niagara System, and apply three stacks of Burning to targets in range. We then create the FireBall Gampeplay Ability, and work through some collision issues with the FireBall Actor.
https://dev.epicgames.com/community/learning/tutorials/2J6j/unreal-engine-44-player-powers-fire-ball-let-s-make-a-top-down-shooter