From publisher blurb:
Ever long for the days of simple one-shot adventures with everything included on one page? No hassle, limited prep? Something you could throw at your players and finish in one session?
This is a short region setting designed to be used with Shotglass Adventures #10-13 as a base of operations for your PCs. Underwold provides a map of the land beneath Verona Province, brief information about its cities, peoples, politics and factions and some handy history from the world of the Invician Imperium, home of every Shotglass Adventure. There are also several new playable lineages for 5e - some might seem familiar to lovers of traditional fantasy, but there are just enough variations to spice things up a bit. As with all Shotglass Adventures, there’s a lot of space for you to improvise as needed.