Bat swarm for spell

[Bethezard]

I need a model for spell what would look like a little swarm of bats, in size, just little larger than normal hero size, and they would fly in whirlwind type trajectory. Just like official dodad "Doodads\Northrend\Props\Bats\Bats", but much more concentrated at one spot and it would be good if them would be little bit larger than in that official dodad.

If anyone would fill my request, I will tell him, how I will use it, where and I will add any credit author would want to my map!

PS: If you did not understood much what I want, comment here and I will try to draw it in paint or by hand on paper...