Thats a completely different thing entirely. Has nothing to do with an "area" or "zone" .. But yes banish does not work on emu even though the field exists on npctypes.
What banish is supposed to do, is any player who gets on vox or naggys aggro (hate) list thats 52+ gets ported out of the dungeon. There is nothing physically stopping lvl 53 players from being in this part of the dungeon. if vox or naggy is not alive. they can farm there all day long. Banish is like an auto skill that vox and naggy receive. AFAIK there's no other mobs in the game that utilize it.
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