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Ability to summon "infernal reinforcements"
The creatures in the hero's army have the ability to summon infernal reinforcements directly onto the battlefield. Heroes of level 1 can only summon low-level creatures – Imps and Horned Demons – and only a small number of creatures from the requested reinforcement will join the battle. However, as the hero's skill level increases, the warriors in his army will be able to summon more powerful creatures, such as Hellhounds and Devils, and in greater numbers. The process of summoning reinforcements takes a certain amount of time – one turn – during which the creatures requesting "infernal aid" will not be able to move or attack the enemy. But you can choose the location where it will ultimately appear on the battlefield (for example, behind the walls of the enemy castle). This unique hero property can be improved by developing the skill and having special buildings in the Inferno cities.