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My opponent said that his huge unit of Possessed with Mark of Tzeentch are not affected by "Banishment" when Ahriman manifested it, because the MoTz keeps giving +1 at all times.

I don't agree with this, and I can't find any discussion on it. During the game I just said "ok" and kept using Gate of Infinity to move Ahriman away (he wanted Slay the Warlord bad) but if Banishment would take them down to a 5++, I'd just focus a few units of TS on them and call it quits. What's the deal?

Thanks

They get +1 and -1. Essentially they cancel each other out,

I guess its technically possible, for crimson slaughter possessed with the mark of tzeentch and sanctuary/cursed earth cast on them, to be effectively immune to banishment.

In your example, yeah they'd cancel out.