Scout evolution
It would be interesting to set up a possibility for a clan or a group of people to gather a large number of scouts to cross a city full of scouts. A bit like we can do in the context of warriors with onslaugh.
This would put an end to some cities of very low influence, having pushed their knowledge and equipment to the max and having hundreds of millions of scouts. These cities can never be spied on.
While a similar city in terms of warriors with a good assault can be demolished in one or more onslaugh.