Power Unleashed

In your hero phase, if garrisoned by a
friendly Seraphon Wizard or Seraphon
Priest, you can pick 1 terrain feature on
the battlefield and roll a dice for each
enemy unit within 3" of that terrain
feature. Add 2 to the roll if it is within
18", subtract 2 if more than 36".
On a 4+, that enemy unit
suffers D3 MW.