Ravenak's gnashing jaws

Casting value of {6} and a range of 8". Set up the endless spell wholly within range of the caster. It
can be moved up to 3D6" and can fly. You can
re-roll the dice if it was summoned in the same
turn. Pick 1 unit that has any models it passed
across or that is within 1" of it at the end of its
move and roll a dice. On a 2+, if the roll for this endless spell's move was greater than that unit's
Move characteristic, that unit suffers a number
of mortal wounds equal to the difference
(roundi