Warding Brand

A fiery sigil causes any who harm these warriors to be
wreathed in flames.
Pick 1 friendly unit wholly within 18" of the
caster that is visible to them. Until the start of
your next hero phase, roll a dice each time a
wound inflicted by a melee weapon is allocated
to a model from that unit and not negated. On
a 4+, the attacking unit suffers 1 mortal wound.