Demonology has a variety of different summoning spells and rituals. Some of these will be explored in greater detail in later books. For readers of Citadel of the Fallen, Summoning spells are used to summon other demons from the Netherworld.
Summoning spells require human blood. The amount needed is based on the strength of the demon being summoned. Also note that, in most cases, a Summoning spell does not compel a demon to leave the Netherworld. The demon must choose to do so.
If a demon does choose to answer a Summoning spell, the caster establishes conditions which the demon must obey. When demons summon other demons, these conditions are generally quite forgiving. When humans or other races summon demons, their conditions are often quite harsh.
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