Sneaky Gitz Boss Snikrot must join one of the units in this Formation, and the whole Formation must be held back as Reserves. When rolling for Reserves, make a single Reserve Roll for all the units in this Formation. All units in this Formation move on from any table edge when they arrive from Reserves, but they must all enter from the same table edge. No dice roll is required to determine where they enter from; the controlling player chooses. Furthermore, on the turn they arrive, whichever turn it is, any unit in this Formation that does not shoot in the Shooting phase can re-roll its failed cover saves until the start of their next turn.
