Inferno’s main forces.

It will be difficult to prevent the demons from stealing mana the first time, as they have more initiative than the hero. If you try to kill the archdevils without killing anyone else, the entire field will be filled with summoned creatures, and the horses and cerberuses will go wild, and the pits will also contribute. It's better to kill them and try to close them with your spells, especially with hypnosis, as every second counts.

The main thing for cerberuses is to bite at least once; they have high initiative for this. But once they bite...
The same can be said about horses, although they live much longer.
And then the rest of the forces will follow.

You need to not only have the cerberuses bite but also open a portal.