Comet of Casandora

12+/24+ to cast
Place a marker anywhere on the battlefield. Roll
a D6 at the start of each magic phase. On 1-3 add
a marker to the pile. On 4+ the spell ends and
each unit within 2D6" of the marker take 2D6
S4 hits, +1 hit and Strength for each marker.
[Whenever you place a marker, place two
instead.] Cannot be dispelled in subsequent turns
Remains in Play.