xienwolf
Deity
Any improvement which spawns critters is considered a Lair. Any Lair which is not flagged as Permanent is instantly destroyed when someone who is at war with the Barbarians moves onto the tile.
Not sure where in the code this is done. But basically it comes down to meaning you either have to have the improvement stop being a lair, or make it permanent and grant a spell which is available to any unit on the tile which is used to remove it (to get around the permanent flag). So of course in your case it is already perfectly lined up to just need to set the Permanent Flag.
Not sure where in the code this is done. But basically it comes down to meaning you either have to have the improvement stop being a lair, or make it permanent and grant a spell which is available to any unit on the tile which is used to remove it (to get around the permanent flag). So of course in your case it is already perfectly lined up to just need to set the Permanent Flag.