Armor of Sacrifice said:Use this power when you are adjacent to an ally who is subject to an effect that a save can end. The ally is no longer affected, and you now have the effect. You cannot make a saving throw against this effect until the end of your next turn.
I had assumed (and therefore I'm likely wrong) that it was referring just to your usual end-of-turn save. But I can see where the case could be made that you couldn't make any saves.
The question is what trumps? The item power saying you can't make a save or some other power (such as Inspiring War Cry or any number of other powers) that says you can?