Serpent Staff

Range: Wholly 12"
In your hero phase, you can pick 1 friendly
SERAPHON unit wholly within 12" of this model.
If you do so, until your next hero phase, if the
unmodified wound roll for an attack made by that
unit is 6, that attack inflicts 1 mortal wound on
the target in addition to any normal damage.
A unit cannot benefit from this ability more
than once per phase.