"Weak demons"??

Anton, don't pretend you don't understand who I'm talking about. And besides, 25 Imps in exchange for a Black Dragon, which is a unit with limited potential, I think it's a sacrifice worth making. Moreover, such large groups of mages are rarely used in the late game. So, the difference of 13 Imps in the late game doesn't matter much. Furthermore, I win many other battles with Succubi without any losses and without using a Black Dragon, so I think the losses are justified.