Having a bit of a disagreement on the rules of physical blasts on swarms that have weapon immunity.
My friend says that says that blasts bypass the swarms weapon immunity
since they always do full damage to swarms, while I say since they have Immunity to weapon damage the physical blast would have no effect on the creautre because its immune to weapon damage and though they do full damage to swarms it does not state they bypass immunites.
(Like how a fire blast would not harm a swarm immune to fire)
Which one of us is right?
http://www.d20pfsrd.com/bestiary/monster-listings/undead/bonestorm
is the monster in question