Vortex of Doom

Roll 2 D6. If the result is greater than the
Converted Mana cost then deal 2 D3 mortal
wounds to the closest visible enemy unit within
12 inches. Then deal 1 mortal wounds to each
enemy unit within 3 inches of that enemy unit.
"The psyker tears a rift between realspace and the
warp, condemning his foes to a total oblivion"
-Grey Knights, Data pack