How about implementing a settler system for tribes instead of just having them pop-up out of nowhere? These would be 2-3 movement units that spawn in lairs after a certain time period, and, once spawned, stops the spawning of creatures from that lair for the next 5-10 turns. They would also have no defense, so that a lair with defenders can't just plop out of Oblivion next to your exploration units.
The lair's units would escort this settler/tribesman unit of course...
The lair's units would escort this settler/tribesman unit of course...
