Each creature which moves through a space in the blast before the end of the encounter must make a hardAcrobaticscheck or be slowed until they break free or escape.
The area is filled with smoke, which grants partial concealment if line of sight passes through one to two spaces of smoke, or total concealment of line of sight passess through three or more spaces of smoke.
Miss:
The attack scatters 1d4 paces in a random direction for every 5 points that your check result missed the difficulty by - roll 1d8 to determine direction.