Atan
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Whoever wrote the bestiary entries for some of the common swarm types seem to have made no attempt at realism. Ant, centipede, spider, cockroach, and many other walking insect swarms all have a speed of 20-30 ft, and I can find no restrictions on double moves or "running". Even without running this means they can move 40-60 feet per round. That is 4.5-7 mph!
Hello, an ant moving 7 mph? Real ants and centipedes struggle to break 1 mph. Morever, there is no way a swarm of 1000s of creatures crawling all over each other can move at their individual maximum speeds. 5 ft would be a generous movement speed for these types of swarms. Swarms of this kind should be pretty much static in a location and only chase the party slowly if at all.
