If the majority of a unit's models are wholly within a mist-wreathed swamp, the unit counts as being in hard cover.

However, at the end of each Movement phase, the unit must pass an Initiative test, or have D6 Infantry models dragged to their doom by the monstrous Fimir lurking in the mist (the victims are selected in the same manner as the allocation of shooting hits). Fimir models are not affected by this.