Plague of Rust

As the Elementalist utters a curse, the armour of the
enemy loses its lustre, corroding and crumbling from
their bodies.
Until your next Start of Turn sub-phase, the target
enemy unit suffers a -2 modifier to its armour val-
-ue. This spell may target an enemy unit engaged in
combat.
"The loss of value will be the last of your problems"