@Mokara - a full series is called a series of creatures consisting of a basic creature and two of its upgrades! The trick is this... when the map generator generates random monsters, the slot in the squad can usually be occupied by the basic creature and sometimes one of the two upgrades... i.e., to put it simply... 300 = basic, upgrade = 301, and alt-upgrade = 302! But if you have 300 = basic, and 307, for example, is an upgrade, and 309 is an alt-upgrade, then it will be illogical!
yes, that's good. For now, I plan to add only some of the creatures, as it turned out that many models are missing parts. Maybe I just didn't find them, but I had to remove the 3rd upgrade for harpies for now...