RTF is a global modification that replaces all towns in the game.

Hey, maybe it would be better to swap the upgrade tiers?

lol, Hottabych already suggested this for the flies, because of the colors; besides the red body, the fly also had purple wings.

Added 16 minutes later
I sometimes think about swapping the upgrade and alt-upgrade tiers, but I'm holding back on that for now. You can judge by the colors that red is closer to the purple upgrade and looks more organic with the original units. There's also the design aspect, where I think both units have an equal right to be called an upgrade. And there's also the original concept where the bloody vampire upgrade was the foundation of the faction, and the green plague one wasn't exactly new troops like the renegades in the Order faction, but rather a strange, distant province that isn't very popular because of its philosophy, but they can't destroy it and are forced to be friends.

Right now, only 3 units are fully ready: skeletons, zombie warriors, and flies. I'm not ready to change the upgrade tiers based solely on their design