Can wandering monsters create lairs?

Never seen it happen. But lairs can be created by quests and events, which may look as if happened due to wandering monsters.

I could give monsters a spell that creates a lair. But I am not sure I would want to. Maybe for turn 500 trolls. I have been thinking about giving them some expansion capabilities. 

Aesome idea. That's for Master's Affliction, right?  And screw turn X triggers.  Can you make it level dependent? So that when the army leader levels high enough, he decides to start his own little keep...

yes, like this alot

my old ideas = https://forums.elementalgame.com/417474 

Actually, I would prefer random spawning monsters to new lairs.  I don't like how once you clear an area of the map it is forever tranquil and peaceful, even if it's not within your borders.  The fog of war should always be uncertain, if not outright dangerous.  Not sure about new lairs, I feel like at a certain level they would just be farming opportunities for high-level sovereigns.  

Ya, I have several random events that do that. Dark Invasion is a great example. A wizard from another realm sends 25 darkling shaman lairs into your realm. They are the scouting force for a much larger invasion. It basically spawns hundreds of units to reset the balance of power. While you are fighting those guys, you may be hit with the real invasion.

I would rather the game spawn the quests, and monsters/lairs in stages.  let the world start out with weaker monsters, then at the mid-game, new lairs are discovered and spawn across the non-settled areas of the map. Finally, at a third stage, many ancient and powerful denizens will awaken.

I would also like to see "Evil Champions" who are killed respawn during stage 3 as zombies of some kind.

The second wave would trigger new monsters to spawn at each lair, changing each lair to +1 stronger monsters. Then each monster still in the world gets several buffs and new ones begin to appear.

This would be more "sane" than having a big blotch of monsters of all shapes and sizes on earth.  Remember fall from heaven? The Armageddon Counter could be used (or something akin) to determine how close the world is to breaking apart. Thus a new purpose in Elemental is to repair the land - Kingdoms and Empires both want to keep the land itself together, and that would be like another way to end the game.

I have always felt the best way to approach this is to have more rabbit hole dungeons, and quests/events that regulate the ebb of the monster tide.  One event i would like to see, is Every "wild shard" (mana crystal outside of borders) begin spawning elementals as though the monster AI had just got binding. In fact, let "Dark Shrine" rabbit holes appear on them for monsters to spawn at and players to "cleanse" or "blight".