Wards and Evothaum

[Taran]

From what I remember, it was a small room.  It created a zone within a zone.

Mutliple zones might be too much without a threshold because multiple zones would imply more than just "a point of transition or intersection"

[vultur]

It had an attached Landmine - a big one. Chances are, it was a Ward.

I think that's more like the potion equivalent of a Warden Sword (an enchanted item with two effects/two enchanted items in a single physical object).

Mutliple zones might be too much without a threshold because multiple zones would imply more than just "a point of transition or intersection"

Yeah, that's probably not even one full zone -- just a doorway or whatever. A zone is big enough for people to swordfight in it.