By the way, I finally found out using Google Translate that "LIMES INFERIOR" translates to "LOWER LIMIT" in Latin.
Added 27 minutes later
The previous page only had videos of battles, so it's unclear. Basically, the trick is this: in the starting area of the Jesus hero, there are Pandora's boxes, from which 60k+ creatures appear in a stack. When moved to the hero's army, their quantity becomes -1. By playing around with this negative value, I found a way to extract any positive value from any such stack (you just have to click for a long time). :)
A similar trick was used before the final battle on the Harry Potter map by Aeris Quamarine, when they gave over 10,000 fairies, also with a negative value, but if you divide them one by one (you get positive units), and then you can combine them (you also have to play around with it) after dividing them into a positive stack