It's nothing. No events. There are a certain number of "pieces" of area that can spawn in each zone. Here's some nice maps and list of the random pieces: http://tinyurl.com/czafjh6 --- "We live in a country Hasire.." ~ yosouf06 REVOLVER STAKE! http://img.photobucket.com/albums/v717/ChocoboMog123/AltEisenRChocoboMog.png
Blizzard has certain place holders that spawn in some places. Like the Stinging Winds in Act2, as far as I know two things can spawn at each end of the map. Sometimes it's that ship for the Black Rock Ledger, sometimes its a bunch of Cultist that say "HE/SHE found the camp!!! Kill them!!". Sometimes it's a big rock that appears to have a nest for those wasp on it. But nothing happens. I guess Blizzard put them there to make the random parts more random. --- How many times do I got to play parolee, mods?