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stormcrow27 wrote:Swarms are easy to handle if you have anything that does energy damage. That's why carrying torches is handy at any level, because you can burn (provided the swarm isn't immune or resistant to fire) them
I don't think there's any rules support for hurting a swarm of spiders or whatever with a torch. Torches don't do area effect damage.
"If a torch is used in combat, treat it as a one-handed improvised weapon that deals bludgeoning damage equal to that of a gauntlet of its size, plus 1 point of fire damage."
So if you are facing a swarm that is immune to your weapon damage, you can use a torch to deal them 1 point of fire damage.
So like 9 rounds of combat (divided by the number of players with torches) for a CR 1 spider swarm, assuming you successfully hit AC 17 each round.