Calling on demons is generally inadvisable, but if you must, here are possibly the best demons to summon. Just be prepared – invoking demonic presences might cause the worst to happen.
Tales of hauntings and poltergeist activity after a summons aren't uncommon, nor are night terrors and sleep paralysis. People report hearing voices in mysterious ancient languages. Summoners' skin has been slashed and scratched during rites, and mysterious illnesses sometimes befall those who attempted to invoke known forces of darkness.
But if the urge is there, these are the demons to summon.
Baal, The Lord Of The Flies
Baal, the Lord of the Flies, is the highest Christian demon one can summon, second only to Satan himself. He was once worshipped as a god, and many cities were named in his honor. Once he joined the ranks of Heaven's fallen angels, he was embraced by the underworld leaders and named one of the seven princes of Hell.
He often appears as an eight-foot-tall human, a cat, or a toad when invoked, and is said to be able to render his summoner invisible upon request. Baal's powers are strongest in October; to call him into our realm, you’ll need black candles, a fern, and items made of either iron or gold.
Eligos, The Great Duke Of Hell
Eligos rules 60 legions of demons in Hell. He's known for strategic foresight in battle and is adept at predicting enemy tactics and positioning. That comes in handy when summoners want to know the next move to make against adversaries.
Eligos is also able to assist his invokers in gathering support from high places for their cause. He is depicted as a ghostly warrior knight, riding a semi-skeletal, demonic horse known as the Steed of Abigor. The horse is itself a minion of Hell, created from the remains of one of the Garden of Eden’s very own dead horses. The steed was gifted to Eligos from Baal. This highly-respected demon is strongest in early June, and to summon him, you will need thyme, copper, and yellow candles. Schedule a daylight ceremony, too.
Agares, The Goetic Demon Of Language
As described in Pseudomonarchia Daemonum, Agares appears as an old falconer on the back of a monstrous reptile. This demon teaches its conjurer in new languages and helps them acquire a high rank in their chosen profession.
Agares is best summoned in late March, while in daylight and burning blood-red candles. Gifts of carnations and items made of copper help welcome Agares into our world.
Glasya-Labolas, Author Of Bloodshed
This dark soul is commonly referred to as both "the President of Hell" and "the Author of Bloodshed." In human form, he appears as a blond, teenaged youth with a brooding face. A rebellious demon, Glasya-Labolas is equipped with a monstrous ability to incite homicide, and is particularly skilled in the art of mass slaughter. He's also incredibly intelligent, having studied the ancient wisdom of his people, and knows the secrets of the occult as well as our own earthly sciences.
Summoners who wish for the heights of wisdom available to humankind should be wary not to be too demanding of Glasya-Labolas; he has a hair-trigger temper and will damn someone’s eternal soul without a second thought. This demon is best invoked in late July using rosemary, yellow candles, an item of gold, and plenty of daylight.