So our newly formed group decides to run "The Godsmouth Heresy" module (very fun.) There's only 3 of us, so as a GM I say "why not start a level up?" So the party is a 2nd level Paladin, Inquisitor, and buffing Cleric. Right about the point I think that they're going to run through this with no problems, they run into a swarm of diminutive creatures. Being immune to weapon damage, the swarm proceeds to run rampant on everyone. That is, until the Cleric has the idea to light himself on fire. He proceeds with his idea and runs through the swarm just killing them before he burns to death (Yay spontaneous cure spells). This only proves the point that swarms, like ninjas can't catch you if you're on fire.