(Help) creating a inkstroke/brush "slash" attack particle effect?

Development Rendering
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Hey everyone! I would like to use Cascade to create a particle effect that looks like this (Black Desert):

https://youtu.be/jIwDITHRr5c?t=54

When the character slashes, you can see the particle effect coming from the sword (looks like a brush stroke). How would you approach creating it? I’m not looking for a tutorial or anything (unless something similar already exists) but any tips would be great.

Thanks!

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Thanks for the video! Helps a lot