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A Lord of Change/Herald of Tzeentch with Forewarning can give any unit a 4+ invulnerable. Alternatively, the Warp Storm table can give everyone +1 to their invulnerable save. Combine it with the Grimoire and it's not that hard to give any unit you like a 2+..

Of course, the only ones that can re-roll them are Tzeentch demons (or any character with the Dark Blessing reward).

Still, if he manages to get it off just ignore the unit and kill the rest. Even a Bloodthirster with a 2+ rerollable can only kill one unit each turn. And with orks you should have enough bodies/sacrificial nobs, no?