Work in Progress...
D&D 5e has plenty of swarms most of which are medium (1 space) swarms of tiny creatures like: Rot Grubs, Ravens, Insects (Wasps), Rats, Bats, and quite a few more.
The only non-tiny creature, medium swarm I have found is the Skeletal Swarm, which is a Large (4 space) swarm of medium sized creatures, which sticks closely to the pattern of the other swarms.
As a DM, I have bumped into situations where I have a large group of relatively low powered small or medium sized creatures creatures that are more powerful than the typically nearly trivial individual member of a swarm. These groups could be productively lumped into a swarm to speed play. I want to explore how I might do this in my games in this posting -- essentially, how to make something like a mob of villagers a single swarm instead of a bunch of individuals to manage.
