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Something u may want to experiment with is emiter angles that change over time (creating the spinning sword) and doing things at odd angles (adds more visual interest). Also i have a love of flying particles so i use them allot. I'll mess with some of the other ideas later when it's not way too early in the morning.
I like the way you made this anim, only one thing: if you didn't told that there were a sword i would never saw it...
maybe by making it bigger it would be greater^^
Continue making lots of anims^^ I realy like them! I wanna see more and more lol