In my setting, they're among the most powerful type of spellcaster.

>Imps/rascals
These are the weakest and therefore the safest types of spirits available for a witch or wizard. Imps and rascals called upon by the summoner usually take the roll of a familiar, accompanying the summoner in every day life by taking the physical form of some sort of animal.
The imp usually requires some sort of minor ritual such as a nightly candlelight vigil or weekly wood carving. In exchange for this they offer the witch or wizard extra amounts of mana/energy/vitality, knowledge, and the assistance that any sort of hired help can offer along with their meager magical abilities.
Breaking a contract with an imp has minimal consequences in the form of a curse that usually resembles a period of bad luck and other minor inconveniences for as long as the imp can be bothered to keep a grudge(which usually isn't more than a month)

>Demons
Demons are smarter and more powerful than imps. Although an imp lacks the intelligence or confidence to do so, a demon might actively plot against the summoner, trying to create a situation in which they break the contract so the demon can collect their reward(the summoner's punishment) for doing so.
A contract with a demon is usually much deeper than with an imp. The demon might reside within the summoner's mind/heart/soul or back in it's own realm and only assist the summoner when called upon.
Demons are much more powerful than imps, and tend to demand sacrifices much deeper and more sinister such as a portion of the summoner's life force, or an altar with worship and sacrifices similar to what a dark deity might desire.
Breaking a contract with a demon can have dire consequences in the form of lifetime curses, a fated tragedy or your life.

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>Fiends
A fiend is a demon that is much more wild, representing an animal in both thinking capabilities and desires.
Fiends usually require living sacrifices like an animal that needs food, although their tastes and requirements can range from animal blood, to human blood. The more particular ones might require special blood such as the blood of babies, virgins, or powerful warriors.
In exchange for this animal-like requirements they tend to offer animal-like services such as being an immensely powerful guard dog or hunting dog that will do everything in it's power to kill the target you give it.

>Devils
Devils are the most powerful spirits, as powerful as the deities some people worship. Normal witches and wizards aren't powerful enough to even summon them, as they have nothing a devil would want. Contracts with devils or similar to demons, although the powers they offer, the sacrifices required for their assistance, and the punishments for breaking their contracts are all multiplied several fold.

>Warlocks
Warlocks are the advanced, more powerful version of a wizard or witch. When witches and wizards make contracts with demons/imps/fiends they adopt the relationship of a mutually beneficial partnership or the relationship of one who is asking a bank for a loan. Warlocks are strong enough to be in the power position of a dominant benefactor or patron and are powerful enough to contact and barter with devils.

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>>54040142
>>54040166
>>54040182

Nice lore OP, what about the less powerful magic users in your setting?

>>54040520

Some of the other magic users are:

>Elementalists - People who learned how to control the natural magic of the earth. They weave together words of power/distance/form/element to create very specified effects

>Shamans/weavers - Elementalists who contact with natural spirits and elementals. creating friendships and bonds in which the spirit offers their assistance to the elementalist

>Necromancers - Wizards who collect bones or objects of significance from dead people to summon them as either ghosts or zombies/skeletons

>Alchemists - people who make magical items/infuse items with magic

>Mystics/divines - two counterpart spellcasters who specialize in pure forms of magic. Mystics have the widest collection of individual spells while divines have a very basic selection of spells that are influenced and improved based on which deity they worship and how deep their devotion is to that deity.

Magic users are also based on specialization and each have their own gimmick/special way of casting spells. For example

Divines can evolve into Thamauturges or Exalted. And then Exalted can turn into Sages or Scions.

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>>54040142
>>54040166
>>54040182
>>54040688
>>54041191

Nice. What are the Elements?