I'm a few sessions into a 5e game where I'm playing an Urban/Sewer Druid. I'm pretty much covered on stuff like turning into tiny and small sized stuff like rats, roaches, pidgeons, and their dire counterparts. But what are some more effective combat wildshapes that are still on brand? I can only think of stuff like Gators and wild dogs. My DM said he's open to moderate reflavoring a statblock and letting me wildshape into a swarm.