I was looking over Archive of Nethys again and noticed that, despite being the planar manifestations of horrible deaths, they have next to no creatures that represent deaths by elements. No representations of freezing, no death by lava or earth-related disasters such as mudslides or earthquakes, not even burning to death. The only thing they have that is element-related is the Hydrodaemon, which represents death by drowning.
Am I missing anybody? Because if I'm not, I'm sort of surprised they haven't shown up yet.
If there were element-based daemons, how would they react with their respective planes? I bet earthly daemons would have an interesting reaction with Ayrzul.
... Now that I think of it, all of the Four Horsemen offer elemental domains. Szuriel offers fire, Trelmariaxian offers earth, Apollyon offers air, and Charon offers water.
The Elemental Lords are also all Neutral Evil as well, but for different reasons. They want to smite the other lords while remaining on top, so they all hate each other. The Horsemen just want everything dead.
I smell a possible plot. Perhaps one of the elemental lords contacts one of the horsemen to help smite their foes. My best guess would be Ymeri calling up Szuriel, since they are both deal with fire and since Szuriel deals with all things war. It might even the start of a beautiful friendship... at least until the other three lords finally croak.
The Lacridaemon represents death by the elements (whether hot or cold) and slow deaths in enclosed spaces like collapsed mines or landslides.
Huh. I thought that Lacridaemons were caused by exposure via domestic abuse. Taking a second look at their description, I know better now.
So that's two element based daemons. Now to wait for more directly elemental daemons to enter the field. Death by being put to the torch or bludgeoning someone to death with a rock is common in Golarion, isn't it? So is death by elemental magic, so how about that? Heck, are there any sonic based outsiders?