Unclear swarm rules

[Michael Thayne]

Originally Posted by Polkageist

e: Ah, there it is, pg35 of DF Exploits, swarms and such are automatically evaded when trying to move through their space. Goes both ways I'm sure, so a swarm can 'swarm' past you without slowing down.

Thanks for this. Though while answering one of my questions, it stubbornly refuses to answer another: "less-than-solid monsters such as ghosts, insect swarms, and evil gas clouds evade and are evaded automatically. Many inflict harm in passing, however." Which ones inflict harm in passing? Who knows! Some do, some don't. Ugh.