Magic

In general, Magic comes from the dead and forgotten. Long ago, the Deitic Beings were caught in a state of massive conflict known as the Deitic War, this conflict resulted in many being bound or killed in combat (at least significantly reduced in ability). This resulted in the area around them (Geographically roughly 150-300 miles to the north and south and looping around latitudinally) containing residue of their abilities. For instance, in the Reaper of Souls 6th circle, the people gained an ability known as Necromancy.

Each Magic exacts a price, however, and as its mortal users do not have the unlimited energy and reserves of those who originally used it, therefor magic users must watch carefully not surpass their limits. Mostly, these are things that replenish in a set cycle, though some have it tied to specific dates or events. When someone uses more than they have, the effects from each magic are different, some rage out of control, others take something that can't be given back, like years off of a life.

Societal effects of magic (general)

Whilst the societal effects of magic range wildly per magic in a region and per culture, there are some key elements which remain the same.

Technological

The main impact of magic on technology is that the larger world has not advanced beyond High Medieval level of technology, relying on Magic rather than advanced technology. There are still some isolated pockets, predominantly with the 7th and 9th circles of Guild and Tinker, of even space-faring technology, however this is largely seen as curiosity as magic can be applied to almost of all of these ends.

Professional

Many new professions have arisen globally, professional antimage, medic (speciffically using necromancy), and Alchemist are among the most common.