I'm playing in D&D 5e. I want to buy barrels of centipedes in Chult. How many swarms can I get per 40 gallon barrel?
Given a 40 gallon barrel, and a 5x5 (medium sized) swarm of centipedes, how many swarms fit in a single barrel?
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Forty gallons appears to be 5.34 cubic feet. A swarm of centipedes is Medium size, which means it normally occupies 25 square feet but the rules don't say to what height.
If the swarm was only two inches tall, then it would occupy a volume of 25/6 = 4.16 cubic feet, and thus could fit in the barrel, assuming that the centipedes on the bottom could survive the weight.
(I'm not sure if the centipedes on the bottom could survive that weight.)
If the swarm was three inches tall, then it would occupy a volume of 25/4 = 6.35 cubic feet and so it could not fit in the barrel.