On the other hand, summoning reinforcements is about prolonging the battle, not intensifying it. It's about applying pressure with a huge amount of units, which, in theory, can be summoned. That is, it's more of a defensive tactic.
But defense doesn't suit the Demons.
Or maybe I just can't defend properly with them. My skills are lacking.
Moreover, summoners disappear if the main unit dies, so using the Demon's ability towards the end of the battle, as a trump card that turns the tide, also seems rather dubious.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!