Damage Reduction (Pathfinder)

[Trenloe]

Ohh I see, so maybe on the swarms when they try to attack it I should manually insert something like "DR: 50-" just so no weapons will be able to penetrate it? Would that work?

Yep, that'll work - assuming no one does more than 50 damage! Then manually adjudicate any exceptions.

[Ken L]

Apparently I had put in a fix for this more than a year ago, it simply adds IMMUNE to slashing/piercing/bludgeoning if the swarm was diminutive/fine and forgotten all about it. It doesn't deal with half-damage for tiny or the 1.5 splash though.