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I recently played a battle with this rule, it is fun!

basicaly, you make one unit out of separate single minatures:
We tried 3 stegadons and skaven assassins(Abley named assassins creed brotherhood!)

Could you expand on that a bit? or link to the specifics of the rule possibly?

IIRC, it meant the unit was immune to psychology and if a member died, it became frenzied and a few other things, which I can't remember.