With this mechanism it is possible to add nice looking effects. The new year fireworks used this mechanism and now I used it for new attack animation for mages and fire attack for dragons.
I hope you like it

without worrying about performance or game size. Exit game and open it again to download updated files by client.
If you like to help me with creating new effects you can download this:
https://libgdx.badlogicgames.com/ci/nightlies/
Download libgdx-nightly-20200229.zip (or newer file). Unzip it. Open console (cmd.exe in windows) in this directory and paste this:
java -cp gdx.jar;gdx-natives.jar;gdx-backend-lwjgl.jar;gdx-backend-lwjgl-natives.jar;extensions\gdx-tools\gdx-tools.jar com.badlogic.gdx.tools.particleeditor.ParticleEditor
Press enter and the effects editor will open.
Here is video explaining how to use it:
https://www.youtube.com/watch?v=w8xkf3O4nho
And here are effects used by the game so far:
http://dmgamestudio.com/ftmmorpg7/effects/
You can download them and open in the above program to see how they work or modify them to create new ones.