Plague Wind

Daemons of Nurgle
Remains in play. Place a small (3") blast template so
that its central hole is within 12" of the caster.
Whilst in play, the template is treated as dangerous
terrain. The template moves D6" in a random
direction during every Start of Turn sub-phase.
Any unit (friend or foe, but not including Daemons
of Nurgle) the moving template touches or moves
over suffers a -1 modifier to its Toughness
characteristic for the remainder of the turn.