Favor of Khorne

is a prayer with an answer value of 3 and a range
of 18". If answered, pick 1 friendly Slaves to
Darkness Mortal unit wholly within range and
visible to the chanter. You can re-roll charge rolls
for that unit until your next hero phase. In
addition, if that unit has the Khorne keyword,
you can re-roll hit rolls for attacks made with
melee weapons by that unit until your next
hero phase