The main task on the adventure board has this big green ”show me where to play best” arrow since 5.x. It should show you where to get your task done. Nice idea!
Unfortunately it doesn’t lead you to the best option but it actually leads you to a random kingdom with the required color in the arcane stone instead. Every time you click it, it opens a new random one.
In my case it opened Sin of Maraj the first time, which has 3/18 troops using brown apparently. I realised it quite soon that something was wrong here.
My suggestion to the devs is to lead us to the best kingdom (=required color troops/total troops ratio). Otherwise it’s quite pointless.