The pheromone arrows state that any creature with scent gets a bonus to hit and damage vs someone hit by a pheromone arrow. Does that include swarms with scent like rat swarms or army ant swarms?
The don't need a to hit bonus, as they deal damage automatically. But what about the damage bonus?
Benefit: Any creature with the scent ability gains a +2 bonus on attack and damage rolls made against a target marked with a pheromone arrow. This effect lasts for 1 hour or until the target spends 1 minute washing.
XP 600
N Tiny animal (swarm)
Init +6; Senses low-light vision, scent; Perception +8
So would a rat swarm deal 1d6+2 damage to a target marked with a pheromone arrow?
That seems to be the case, given the quoted passages and no other rules on the matter.