Unrelenting force

You yell in a direction, projecting your voice into a gale of wind. Doing 5d6 force damage, to everyone in the area, also knocking all credit in the area prone an pushing all creatures and objects 30 ft away from you.

targets with a flying speed make the save with disadvantage 

if you  cast the spell at 5th level or more all targets get -2 to the save