Northoak, Nightmare, village is in the right bottom corner of the map, seperated from the rest of the map by the river.
As the fire elementals avoid water now they can't reach my village. The problem is that the fire elementals start to collect on a single spot at the river and try to destroy the river (Clearing obstacles out of the way) and just keep standing there as they can't destroy the water. Even in the winter when they could reach the villag because the water is frozen, they keep standing there trying to destroy the water. Highest amount of elementals i counted were about 150.
(Was reproduced by Tiberiumkyle)