Summoner

A summoner (召喚師 Shōkan-shi) is a person who is capable of artificially calling in gods and monsters from the other world to this one.

Principles
Modern summoners work in pairs with a vessel. They use the Blood Sign ceremony to summon Materials by carving out their names and having them possess their vessel. Summoners are knowledgeable in the use of magic, but the most magic a human can do on their own is to construct a Blood-Sign for the summoning ceremony. A person does not need talent to be a summoner. All summoners have to start a battle with the Original series and have to work up to more and more powerful Materials. Nobody gets a convenient seed position from their bloodline, an item they inherited, or special training. Even the greatest expert has to start at the beginning and even the lowest rookie has a chance of using the strongest Material.

Besides jobs that lead to them fighting other summoners, summoners also do side-jobs to get extra money, such as basic ghost or monster extermination requests and sealing ancient texts.