A THREAD FOR NEWCOMERS!

Please explain in what cases it is necessary to build a Guildhall in two cities. I don't quite understand. This is from the additional rules of M200.

This means that if you have, for example, a scroll of level 4-5 and you want to use it, but you only have cities like Swamp and Stronghold (where the maximum guild level is 3), then you need to fully build up these guilds before using the scroll.