When I started painting my new Skaven army, I made my own movement trays. I made one for 5 Rat Ogres with 2 Moulder Packmasters, as below.
I made that with the placement from when I played Skaven many years ago in mind. Is this an illegal formation now?
Also, how do you or your opponents normally form up rat darts? I seem to see this formation mostly:
front
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X X
X X
X Y
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rear
Is a 3x2 tray the optimal size for a rat dart?