@JeremyECrawford Came up in an @DnD_AdvLeague game. Can swarms take opportunity attacks as their reach is 0ft?

— Matt Jackson (@Mattwilljackson) June 6, 2016

A swarm's reach is the same as its space. Leave the space and trigger an opportunity attack. #DnD https://t.co/eoWd45vTbQ

— Jeremy Crawford (@JeremyECrawford) June 6, 2016