Please add Upgrade requirements for all building because it is impossible to plan "how much resources i need to request in 4 supply chains".
For e.g. I need to upgrade 2-3 consequent levels of building and i don't know how much it will cost.
When i could count all resources for Upgrade i can moving through Dragonheir Journey more efficiently and more often play a game (which leads to more payments also).
Let's make Dragonheir friendlier for Players & profitable for Developers together!