In light of Tier 4 troops now being almost completely available for training (just waiting for Ranged troops atm), I thought it would be handy for those that do not train them yet, to chart which buildings and researches you have to upgrade to train them. It’s gonna take a lot of time to get there, and once there, the troops also train hella slow, but here goes.
The below chart lists all building and research dependencies. Red stars denote lvl 10 buildings, yellow stars runecrafting. Red numbers denote allowed differences in level. For example, Masonry needs to be at level 2 to research level 10 Siege Weapons. These numbers might change during leveling up, but this is what I saw at the time of writing.
No clue, but I hope it helps some of you in deciding which buildings to spend HBC’s on…Good luck!