Unclear swarm rules

[sir_pudding]

Originally Posted by Michael Thayne

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.

Stuff with auras or persistent area affects, this probably mostly for ghosts and evil gas clouds, although some weird swarms probably also can do these things.