How many Niagara systems to use for a game vfx

Hi. I am new to learning Niagara. I am wondering when if at all an in-game effect should be made of 1 or multiple systems, and if multiple what is the way to get 2 systems to Link up and tie into an animation. My exanple is a player summons an aura around themselves. About 1.5 seconds later a meteor strikes in front of them, when it impacts the player aura goes away.

Generally speaking, having less systems playing at t he same time will be better. System tick has some overhead as well as the component an potentially actor you used to managed the system.

If it’s an animation, you can just have 2 animation notifies.

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