Summon greater demon

Summon greater demon was a conjuration spell that summoned a single strong demon from the depths of the Abyss.

Effects
The spell conjured a demon of the caster's choice, among several options that included barlgura, shadow demon, babau, dybbuk, bulezau, rutterkin, and other demons of similar or smaller strength. As the caster grew in power and experience, it became possible to summon even stronger demons.

The demon appeared in a visible points of the caster's choice within a range of 60 feet (18 meters). It obeyed the caster's verbal commands, but constantly attempted to resist them. If the caster knew the demon's true name, it became considerably easier to control. In the absence of any commands, the demon only attacked in self-defense. If the caster's control over the demon ended, it entered a rampage, pursuing and attacking every creature in sight that was not a demon, including the caster, starting with the ones that were closest to it. The caster could form a protective circle large enough to surround one human-sized creature, using up the blood that was required to cast the spell. The summoned demon could not cross the circle or harm anyone inside it.

The demon remained summoned for up to 1 hour, as long as the caster kept concentrating, or until killed. It immediately disappeared when killed or when the spell reached its full duration, but, if the caster broke concentration early, the demon still remained for several seconds before returning to the Abyss.

Components
The spell required only verbal, somatic, and material components. The material required was blood from a humanoid killed within 24 hours of the casting of the spell. The blood could not be reused as a component if used to draw the protective magic circle.