Suffocating Gravitide

This endless spell is summoned with a spell that has
a casting value of {6} and a range of 8". If successfully cast, set up the endless spell wholly
within range of the caster.
This endless spell is a predatory endless spell. It can
be moved up to 12" and can fly.
After this endless spell has moved, for each unit that
has any models it passed across, roll number of dice
equal to the number of models in that unit. For each
5+, that unit suffers 1 mortal wound.