Quick notes on "natural" magic

There are multiple forms of "natural" or inherent magic, magical styles that grew traditionally with the races, or that different races have affinities for, and all of them have ways of attempting with varying degrees of success to avoid corruption. 

Elemental (Sinodyte, hypothetical bird folk )

Druidic (Lotho, Aelth)

Shamanic (Shar, geb)

Dreamers (hypothetical sea folk)

Druidic magic uses and manipulates the life force inherent in the natural world. Corruption is unusual but not unheard of, as all life force on Maeleff is tied together with magic. 

Shamanic magic invokes local spirits. Again, as with Druidic magic, those spirits are composed of life force, which is tied ultimately to the same poisoned pool. Spirits may become corrupted, and so may those that work with them.

Elemental magic had the same dangers as sorcery. Slow, gradual and simple uses are fairly safe, anything else is extremely risky.

The sea folk (think deep ones) are mystics who divine with dreams, and manipulate dreams. It is a slow and simple form of magic and is fairly safe, though not absolutely so. 

Kel Mar, 38th Tyrant of Ammadhur.

Shar

Sava

Duer

Notes on magical traditions

Druidic magic exists, practiced primarily by the Lotho. The Aelth dabble in it, but they're really the "guardians of the forest" types, so much as the "vicious bastards that live in the forest".  Lotho Druids are known to frequently use an affect similar to the D&D/Pathfinder spell "Awaken", on plants and animals. Unfortunately, the awakened beam magical in nature, and are subject to the Blood. This has been the cause of a number of despoiled areas.

Shar magic tends to be Shamanic in nature.

Sava have no magical tradition, for obvious reasons.

Geb magic is primarily shamanic and personal, concerned with changes to oneself more than anything else. Includes blood rites and sacrifice.

Kin are very adaptable, and use any kind of magic they can find,their own traditions are ceremonial in nature, with spells traditionally cast by entire troupes working together.

Sinodyte magic is rare, and tends to be elemental in nature when it exists.

Umami magic is arcane and ceremonial in nature.

Duer magic is a combination of ceremony and enchantment.